Log In with Gmail after publishing

1.- Click on Settings and click on App Signature.

2.- Copy the fingerprint of the SHA‑1 certificate

3.- Enter the Firebase console https://console.firebase.google.com/ 6 and select the project to which your app belongs.

4.- Click on Settings, and click on Project Settings.

5.- In the General section, in your applications, click on the name of the app.

6.- Click on Add fingerprint.

7.- Click on the copy icon, paste in your certificate fingerprint, and click on Save