Firebase Android: Google Sign In Failure

Question

First of all, I have to say I'm very very new to Android development so forgive me if I overlook something obvious.

For a university project, I have to create an app that first authenticates users via their Google Account using Firebase. I first followed the instructions I found here.

For a start, I copy pasted this code from Firebase Tutorial. Everything seems to be working, except for one thing :

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.d(TAG, "------------------ onActivityResult ------------------");
    super.onActivityResult(requestCode, resultCode, data);

    // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
    if (requestCode == RC_SIGN_IN) {
        GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
        if (result.isSuccess()) {
            Log.d(TAG, "------------------ googleSignInSuccess ------------------");
            // Google Sign In was successful, authenticate with Firebase
            GoogleSignInAccount account = result.getSignInAccount();
            firebaseAuthWithGoogle(account);
            // Start menu activity once the user has been logged in
            Intent intent = new Intent(this, MenuActivity.class);
            startActivity(intent);
        } else {
            Log.d(TAG, "------------------ googleSignInFailure ------------------");
            // Google Sign In failed, update UI appropriately
            // [START_EXCLUDE]
            //Log.d(TAG, result.getStatus().getStatusMessage());
            updateUI(null);
            // [END_EXCLUDE]
        }
    }
}

Here, result.isSuccess() == false. So I think the Google authentication fails for some reason I cannot understand. I am sure I entered the right password, I also enabled Google Account authentication in my app's Firebase Console.

Thank you very much in advance if you can help me.

EDIT : To be more precise, the first time I run the program on my emulator (or after each time I wipe data from it), I have to enter my Google credentials in the dedicated Google login activity that pops up. This works fine and the same activity seems to successfully authenticate me. However after that, result.isSuccess() is still false and I don't understand why.

Answer 1

I finally found the problem, I made a mistake while authenticating my app in the Firebase Console here (section "before you begin"), 4th step. I entered the debug one instead and it works now.

Thanks nonetheless!