java.lang.IllegalArgumentException: Must specify an idToken or an accessToken
I was reviewing my entire code and I found that i didn't set the requestIdToken while building GoogleSignInOptions. The correct code is:
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();
You need to get web client Id from your app dashboard in Firebase and paste it here.
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken("firebase_web_client_id_for_google")
.requestEmail()
.build();