Why is My Firebase Authentication Suddenly Throwing \"This app is not authorized to use Firebase Authentication\" Error?

Debugging "This app is not authorized to use Firebase Authentication" Error

Firebase Authentication initially functioned properly, but abruptly failed during debug build without any code modifications. The console reported the following error:

D/PhoneAuthActivity( 7392): signInWithCredential:failure:com.google.firebase.auth.FirebaseAuthException: This app is not authorized to use Firebase Authentication. Please verifythat the correct package name and SHA-1 are configured in the Firebase Console. [ App validation failed ].

The only significant change between successful and failing login attempts was an Android Studio upgrade.

Solution

To resolve this issue, it is crucial to verify the following:

1. Google Play Console Fingerprint:

   • Navigate to Play Store Console > Your project > Release > Setup > App integrity.
   • Retrieve both the SHA-1 and SHA-256 certificate fingerprints.

2. Firebase Console Fingerprint:

   • Go to Firebase Console > Your project > Settings of the app > Add Fingerprint.
   • Enter BOTH SHA-1 and SHA-256 fingerprints obtained from the Google Play Console, one by one.

3. Local SHA-1 and SHA-256:

   • Obtain the local SHA-1 and SHA-256 using ./gradlew signingReport.
   • Add these fingerprints to the Firebase app settings as well.

4. Emulator Limitations:

   • Phone OTP verification through an emulator will not work due to the absence of a SIM. Test on a mobile device instead.

5. Android Device Verification:

   • Ensure that the Android Device Verification step is enabled properly with the correct project selected.

6. google-services.json Update:

   • Verify that you are using the latest version of google-services.json file after making the necessary changes.

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