MAUI .NET 8.0 v 8.0.90 Android WebView with SharePoint page - "We couldn't sign you in. Please try again." followed by "Unknown error." in SharePoint

[mgschwendner]

Description

Was working fine for several months, and now SharePoint will not sign in from WebView in a Android app built using MAUI .NET 8.0 for users who have previously authenticated. Issues started happening this week. I get the error: "We couldn't sign you in. Please try again." followed by "Unknown error."

Tried with no effect: (1) Cleared the app cache, deleted data on both the custom app and System WebView - no effect. (2) Reinstalling the custom app - same sequence of issues. (3) Other MAUI apps - same issue. (4) Reinstalling the O365 apps (Outlook, Teams, M365) - no effect. (5) Opened the app in the Chrome browser - so far, no issues.

Issues also explained here:

https://learn.microsoft.com/en-us/answers/questions/2057452/maui-net-8-0-android-webview-with-sharepoint-page https://issues.chromium.org/issues/368222743

Steps to Reproduce

1. Create a ContentView with a WebView Control and a Sharpoint page as Source "https://xxx.sharepoint.com"
2. Build for Android
3. Start App
4. Sharepoint Azure Login-Screen shows
5. Enter credentials
6. Accept MFA if neccessary
7. You are redirected to Account Choose page of Azure with error ""We couldn't sign you in. Please try again."

Link to public reproduction project repository

No response

Version with bug

8.0.90 SR9

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

Android up from Version 11

Did you find any workaround?

No response

Relevant log output

No response

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