I am setting GoogleSignInOptions and Google Api Client like this
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SI
Follow all the step!!..
Release APK and debug APK has different SHA1 and different API keys for google services. Both of them must be added in Firebase Console -> Project settings. Then download google-services.json from here, add it to project and recompile with release keystore using the option "Build signed APK". That should work
and also read carefully...
https://developer.android.com/studio/publish/app-signing