Redirection to Captcha Verification on iOS while doing phone auth

[Rohit-RA-2020]

Is there an existing issue for this?

• [X] I have searched the existing issues.

Which plugins are affected?

Auth

Which platforms are affected?

Android, iOS

Description

I'm using Firebase Phone Auth in my Flutter app but every time a user enters his phone number for OTP verification it takes to Captcha verification even on release mode. I have set up all the SHA keys and APNs (Because I'm getting notifications), but that does not remove and this behavior impacts the user experience.

Kindly guide me through the steps to remove this behavior.

Reproducing the issue

Added a screen recording to understand the issue.

https://github.com/firebase/flutterfire/assets/53489549/d6db5b9c-5dfb-4634-85d7-dd5f3b3dffc1

Firebase Core version

2.24.2

Flutter Version

3.10.6

Relevant Log Output

No response

Flutter dependencies

Expand Flutter dependencies snippet

```yaml Replace this line with the contents of your `flutter pub deps -- --style=compact`. ```

Additional context and comments

No response

[russellwheatley]

Hey @Rohit-RA-2020 - See documentation here: https://firebase.google.com/docs/auth/ios/phone-auth?_gl=1*18z1wu6*_up*MQ..*_ga*MTU5MTcwNDU5Ny4xNzE0MDMzOTgz*_ga_CW55HF8NVT*MTcxNDAzMzk4Mi4xLjAuMTcxNDAzMzk4Mi4wLjAuMA..#enable-app-verification

Quote:

reCAPTCHA verification: In the event that sending or receiving a silent push notification is not possible, such as when the user has disabled background refresh for your app, or when testing your app on an iOS simulator, Firebase Authentication uses reCAPTCHA verification to complete the phone sign-in flow. The reCAPTCHA challenge can often be completed without the user having to solve anything.

recaptcha fails in the above scenarios.

To enable silent notifications to minimise recaptcha verification, follow this documentation.