Google sign in signed apk not working

Question

Well all works till i generate the signed apk . I followed the entire process as told on the google developers page

1.I generated the google-services.json file with

Answer 1

It is hardly difficult to find the place to activate inside the huge developer console. May be I will help somebody in the future. You have to register your Android application here - "enable Sign-In" in this page:

Just input usual for console developer values this your signed SHA-1. That's it!