Firebase phone auth not initiating OTP only in release mode but works on Debug mode even after added sha1 for release mode

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Steps how I implemented.

As advised, I implemented all the way. It was quite good in debug mode. Unfortunately its not working in release mode even I added my debug and release sha1 keys in firebase console.

Step 1. Coding part is here

final PhoneVerificationCompleted verificationCompleted =
    (PhoneAuthCredential user) {
  successMessage('Your phone number verified successfully!');
  _loginNotifier.validate();
};

 final PhoneVerificationFailed verificationFailed = (FirebaseAuthException authException) {
  errorMessage('Phone number verification failed. Code: ${authException.code}. Message: ${authException.message}');
  print(
      'Phone number verification failed. Code: ${authException.code}. Message: ${authException.message}');
};

 final PhoneCodeAutoRetrievalTimeout codeAutoRetrievalTimeout =
    (String verificationId) {
  this._verificationId = verificationId;
  print("time out");
};

 firebaseAuth = FirebaseAuth.instance;
firebaseAuth.verifyPhoneNumber(
    phoneNumber: '+$_phoneWithCC',
    timeout: const Duration(seconds: 60),
    verificationCompleted: verificationCompleted,
    verificationFailed: verificationFailed,
    codeSent: codeSent,
    codeAutoRetrievalTimeout: codeAutoRetrievalTimeout);

Step 2: Here is the firebase console sha1 keys for debug and release mode

Added all three different sha1 keys but still not working:(

Error I am getting:

As I said, in debug mode all good as expected But in release mode, after initiating the otp function, immediately PhineVerificationFailed with null message and null code.

If still anything I missed please advice. Thanks all

4 Answers

Apart from SHA1 - you also need SHA256 thumbprint for release apk.
I faced similar issue for firebase google authentication.
Can you add SHA256 thumbprint to firebase project console and try again ?

After adding SHA1 you have to reinstall your app from Google Play.

Besides adding sha256 and SHA1, you need to add your email in the Firebase console. See the attached image.

enter image description here

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