I work with Google Play Games Services. I took the code from the official example. Try with API 27 and with API 17.
All works only under one account (owner Google Develo
Following this Google Game Doc should be enough: https://developers.google.com/games/services/android/signin
You should use:
GoogleSignInOptions gso = new GoogleSignInOptions .Builder(GoogleSignInOptions.DEFAULT_GAMES_SIGN_IN) .requestEmail() .build();