Native Linking Failed for Xamarin.Google.iOS.MobileAds

[StoatsOnAPlane]

I have a project that runs fine and shows test ads in debug, but release mode will not build due to linker errors. If I remove the MobileAds api, the project builds in release mode again.

1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _CGSizeFromGADAdSize. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons.GetCGSize. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADAdSizeEqualToSize. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons.Equals. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADAdSizeFromCGSize. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons.GetFromCGSize. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADAdSizeFromNSValue. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._GetFromNSValue. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADAdSizeFullWidthLandscapeWithHeight. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons.GetFullWidthLandscape. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADAdSizeFullWidthPortraitWithHeight. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons.GetFullWidthPortrait. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADAdSizeIsFluid. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons.AdSizeIsFluid. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADCurrentOrientationAnchoredAdaptiveBannerAdSizeWithWidth. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons.GetCurrentOrientationAnchoredAdaptiveBannerAdSize. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADCustomEventAdNetworkClassName. This symbol was referenced by the managed member Google.MobileAds.ResponseInfo.CustomEventAdNetworkClassName. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADErrorUserInfoKeyResponseInfo. This symbol was referenced by the managed member Google.MobileAds.ResponseInfo.ErrorUserInfoKey. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADGoogleAdNetworkClassName. This symbol was referenced by the managed member Google.MobileAds.ResponseInfo.GoogleAdNetworkClassName. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADLandscapeAnchoredAdaptiveBannerAdSizeWithWidth. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons.GetLandscapeAnchoredAdaptiveBannerAdSize. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADMaxAdContentRatingGeneral. This symbol was referenced by the managed member Google.MobileAds.MaxAdContentRatingConstants.General. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADMaxAdContentRatingMatureAudience. This symbol was referenced by the managed member Google.MobileAds.MaxAdContentRatingConstants.MatureAudience. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADMaxAdContentRatingParentalGuidance. This symbol was referenced by the managed member Google.MobileAds.MaxAdContentRatingConstants.ParentalGuidance. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADMaxAdContentRatingTeen. This symbol was referenced by the managed member Google.MobileAds.MaxAdContentRatingConstants.Teen. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADNativeCustomTemplateAdMediaViewKey. This symbol was referenced by the managed member Google.MobileAds.NativeCustomTemplateAd._MediaViewKey. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADPortraitAnchoredAdaptiveBannerAdSizeWithWidth. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons.GetPortraitAnchoredAdaptiveBannerAdSize. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADUnifiedNativeAdChoicesViewAsset. This symbol was referenced by the managed member Google.MobileAds.UnifiedNativeAdAssetIdentifiers.AdChoicesViewAsset. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADUnifiedNativeAdvertiserAsset. This symbol was referenced by the managed member Google.MobileAds.UnifiedNativeAdAssetIdentifiers.AdvertiserAsset. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADUnifiedNativeBodyAsset. This symbol was referenced by the managed member Google.MobileAds.UnifiedNativeAdAssetIdentifiers.BodyAsset. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADUnifiedNativeCallToActionAsset. This symbol was referenced by the managed member Google.MobileAds.UnifiedNativeAdAssetIdentifiers.CallToActionAsset. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADUnifiedNativeHeadlineAsset. This symbol was referenced by the managed member Google.MobileAds.UnifiedNativeAdAssetIdentifiers.HeadlineAsset. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADUnifiedNativeIconAsset. This symbol was referenced by the managed member Google.MobileAds.UnifiedNativeAdAssetIdentifiers.IconAsset. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADUnifiedNativeImageAsset. This symbol was referenced by the managed member Google.MobileAds.UnifiedNativeAdAssetIdentifiers.ImageAsset. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADUnifiedNativeMediaViewAsset. This symbol was referenced by the managed member Google.MobileAds.UnifiedNativeAdAssetIdentifiers.MediaViewAsset. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADUnifiedNativePriceAsset. This symbol was referenced by the managed member Google.MobileAds.UnifiedNativeAdAssetIdentifiers.PriceAsset. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADUnifiedNativeStarRatingAsset. This symbol was referenced by the managed member Google.MobileAds.UnifiedNativeAdAssetIdentifiers.StarRatingAsset. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _GADUnifiedNativeStoreAsset. This symbol was referenced by the managed member Google.MobileAds.UnifiedNativeAdAssetIdentifiers.StoreAsset. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _IsGADAdSizeValid. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons.IsAdSizeValid. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _NSStringFromGADAdSize. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._GetNSString. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _NSValueFromGADAdSize. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._GetNSValue. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: DFPBannerView. The symbol '_OBJC_CLASS_$_DFPBannerView' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: DFPBannerViewOptions. The symbol '_OBJC_CLASS_$_DFPBannerViewOptions' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: DFPCustomRenderedAd. The symbol '_OBJC_CLASS_$_DFPCustomRenderedAd' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: DFPInterstitial. The symbol '_OBJC_CLASS_$_DFPInterstitial' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: DFPRequest. The symbol '_OBJC_CLASS_$_DFPRequest' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: FIRApp. The symbol '_OBJC_CLASS_$_FIRApp' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: FIRConfiguration. The symbol '_OBJC_CLASS_$_FIRConfiguration' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: FIROptions. The symbol '_OBJC_CLASS_$_FIROptions' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADAdChoicesView. The symbol '_OBJC_CLASS_$_GADAdChoicesView' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADAdLoader. The symbol '_OBJC_CLASS_$_GADAdLoader' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADAdLoaderOptions. The symbol '_OBJC_CLASS_$_GADAdLoaderOptions' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADAdReward. The symbol '_OBJC_CLASS_$_GADAdReward' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADAdValue. The symbol '_OBJC_CLASS_$_GADAdValue' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADAdapterStatus. The symbol '_OBJC_CLASS_$_GADAdapterStatus' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADAppOpenAd. The symbol '_OBJC_CLASS_$_GADAppOpenAd' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADAppOpenAdView. The symbol '_OBJC_CLASS_$_GADAppOpenAdView' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADAudioVideoManager. The symbol '_OBJC_CLASS_$_GADAudioVideoManager' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADBannerView. The symbol '_OBJC_CLASS_$_GADBannerView' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADCustomEventExtras. The symbol '_OBJC_CLASS_$_GADCustomEventExtras' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADCustomEventRequest. The symbol '_OBJC_CLASS_$_GADCustomEventRequest' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADDebugOptionsViewController. The symbol '_OBJC_CLASS_$_GADDebugOptionsViewController' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADDefaultInAppPurchase. The symbol '_OBJC_CLASS_$_GADDefaultInAppPurchase' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADDelayedAdRenderingOptions. The symbol '_OBJC_CLASS_$_GADDelayedAdRenderingOptions' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADDisplayAdMeasurement. The symbol '_OBJC_CLASS_$_GADDisplayAdMeasurement' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADDynamicHeightSearchRequest. The symbol '_OBJC_CLASS_$_GADDynamicHeightSearchRequest' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADExtras. The symbol '_OBJC_CLASS_$_GADExtras' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADInAppPurchase. The symbol '_OBJC_CLASS_$_GADInAppPurchase' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADInitializationStatus. The symbol '_OBJC_CLASS_$_GADInitializationStatus' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADInstreamAd. The symbol '_OBJC_CLASS_$_GADInstreamAd' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADInstreamAdView. The symbol '_OBJC_CLASS_$_GADInstreamAdView' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADInterstitial. The symbol '_OBJC_CLASS_$_GADInterstitial' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADMediaContent. The symbol '_OBJC_CLASS_$_GADMediaContent' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADMediaView. The symbol '_OBJC_CLASS_$_GADMediaView' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADMobileAds. The symbol '_OBJC_CLASS_$_GADMobileAds' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADMultipleAdsAdLoaderOptions. The symbol '_OBJC_CLASS_$_GADMultipleAdsAdLoaderOptions' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADMuteThisAdReason. The symbol '_OBJC_CLASS_$_GADMuteThisAdReason' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADNativeAd. The symbol '_OBJC_CLASS_$_GADNativeAd' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADNativeAdImage. The symbol '_OBJC_CLASS_$_GADNativeAdImage' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADNativeAdImageAdLoaderOptions. The symbol '_OBJC_CLASS_$_GADNativeAdImageAdLoaderOptions' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADNativeAdMediaAdLoaderOptions. The symbol '_OBJC_CLASS_$_GADNativeAdMediaAdLoaderOptions' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADNativeAdViewAdOptions. The symbol '_OBJC_CLASS_$_GADNativeAdViewAdOptions' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADNativeCustomTemplateAd. The symbol '_OBJC_CLASS_$_GADNativeCustomTemplateAd' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADNativeExpressAdView. The symbol '_OBJC_CLASS_$_GADNativeExpressAdView' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADNativeMuteThisAdLoaderOptions. The symbol '_OBJC_CLASS_$_GADNativeMuteThisAdLoaderOptions' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADRequest. The symbol '_OBJC_CLASS_$_GADRequest' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADRequestConfiguration. The symbol '_OBJC_CLASS_$_GADRequestConfiguration' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADRequestError. The symbol '_OBJC_CLASS_$_GADRequestError' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADResponseInfo. The symbol '_OBJC_CLASS_$_GADResponseInfo' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADRewardBasedVideoAd. The symbol '_OBJC_CLASS_$_GADRewardBasedVideoAd' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADRewardedAd. The symbol '_OBJC_CLASS_$_GADRewardedAd' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADSearchBannerView. The symbol '_OBJC_CLASS_$_GADSearchBannerView' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADServerSideVerificationOptions. The symbol '_OBJC_CLASS_$_GADServerSideVerificationOptions' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADUnifiedNativeAd. The symbol '_OBJC_CLASS_$_GADUnifiedNativeAd' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADUnifiedNativeAdView. The symbol '_OBJC_CLASS_$_GADUnifiedNativeAdView' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADVideoController. The symbol '_OBJC_CLASS_$_GADVideoController' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: GADVideoOptions. The symbol '_OBJC_CLASS_$_GADVideoOptions' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: PACAdProvider. The symbol '_OBJC_CLASS_$_PACAdProvider' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: PACConsentForm. The symbol '_OBJC_CLASS_$_PACConsentForm' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5211: Native linking failed, undefined Objective-C class: PACConsentInformation. The symbol '_OBJC_CLASS_$_PACConsentInformation' could not be found in any of the libraries or frameworks linked with your application.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _PACErrorDomain. This symbol was referenced by the managed member Google.MobileAds.Consent.ConsentInformation.ErrorDomain. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _PACUserDefaultsRootKey. This symbol was referenced by the managed member Google.MobileAds.Consent.ConsentInformation.UserDefaultsRootKey. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _PACVersionString. This symbol was referenced by the managed member Google.MobileAds.Consent.ConsentInformation.VersionString. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kDFPSimulatorID. This symbol was referenced by the managed member Google.MobileAds.DoubleClick.Request.SimulatorId. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdLoaderAdTypeDFPBanner. This symbol was referenced by the managed member Google.MobileAds.AdLoaderAdTypeExtensions.kGADAdLoaderAdTypeDFPBanner. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdLoaderAdTypeNativeAppInstall. This symbol was referenced by the managed member Google.MobileAds.AdLoaderAdTypeExtensions.kGADAdLoaderAdTypeNativeAppInstall. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdLoaderAdTypeNativeContent. This symbol was referenced by the managed member Google.MobileAds.AdLoaderAdTypeExtensions.kGADAdLoaderAdTypeNativeContent. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdLoaderAdTypeNativeCustomTemplate. This symbol was referenced by the managed member Google.MobileAds.AdLoaderAdTypeExtensions.kGADAdLoaderAdTypeNativeCustomTemplate. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdLoaderAdTypeUnifiedNative. This symbol was referenced by the managed member Google.MobileAds.AdLoaderAdTypeExtensions.kGADAdLoaderAdTypeUnifiedNative. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdSizeBanner. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._Banner. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdSizeFluid. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._Fluid. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdSizeFullBanner. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._FullBanner. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdSizeInvalid. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._Invalid. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdSizeLargeBanner. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._LargeBanner. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdSizeLeaderboard. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._Leaderboard. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdSizeMediumRectangle. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._MediumRectangle. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdSizeSkyscraper. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._Skyscraper. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdSizeSmartBannerLandscape. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._SmartBannerLandscape. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADAdSizeSmartBannerPortrait. This symbol was referenced by the managed member Google.MobileAds.AdSizeCons._SmartBannerPortrait. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADErrorDomain. This symbol was referenced by the managed member Google.MobileAds.RequestError._ErrorDomain. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5214: Native linking failed, undefined symbol: _kGADSimulatorID. This symbol was referenced by the managed member Google.MobileAds.Request.SimulatorId. Please verify that all the necessary frameworks have been referenced and native libraries linked.
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error MT5201: Native linking failed. Please review the build log and the user flags provided to gcc: "-LNative References" -lfmod -force_load "Native References/libfmod.a" "-LNative References" -lfmodstudio -force_load "Native References/libfmodstudio.a" -ObjC -lz -lsqlite3 -ObjC -lc++ -lsqlite3 -lz
1>  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(842,3): error : linker command failed with exit code 1 (use -v to see invocation)

I have a attached a full build log (its long) buildlog.txt

It looks like there are some similar issues already open. Some have suggested adding a dummy variable to Firebase core like this: var foo = Firebase.Core.Configuration.SharedInstance; and also downgrading Xamarin.Build.Download Package from 0.10.0 to 0.4.11. But none of these work for me

I have tried turning linking off, but get the same errors, which seems strange to me.

Visual Studio Community 2019 v16.6.2 Xamarin.Build.Download v0.10.0 Xamarin.Firebase.iOS.Core v6.6.6 Xamarin.Google.iOS.MobileAds v7.57.0

[StoatsOnAPlane]

Random update: I've found that if I change this to ARM64 only, it will build in release mode. I don't know if this build actually runs as I only have an iPad2 to test with! Does this give any extra clues?