Forgive me for asking but I am a newbee for mobile app development. I have been trying to build a simple app to verify users using phone number through sending an OTP. However, I am keep getting this error and I clueless as to what to do.

Verification Failed: This app is not authorized to use Firebase Authentication. Please verify that the correct package name, SHA-1, and SHA-256 are configured in the Firebase Console. [ Invalid app info in play_integrity_token ]

I am using Flutter, Firebase CLI and Android Studio. Emulator : Google Pixel Fold API 35

I have tried reading threads here which dated a few years back but it didn’t help.

NOTE: I have verified by SHA-1 and SHA-256 keys and they are correct. I have also added the debug token to the firebase console. I have enabled authentication and app check in the console and Google Play App Integrity API is also enabled in the google cloud platform.

This app only works if I add test numbers to the firebase console. It doesn’t work when I try to get the OTP to a real number. What should I do? Please help me.