UNREGISTERED_ON_API_CONSOLE while getting OAuth2 token on Android

Question

We\'re under Android (Jellybean and higher), and we\'ve got an app which need to use OAuth2 with Google for authentication.

I simplified the login activity, but it\'

Answer 1

For me, the problem was Signing-certificate fingerprint (SHA-1) of the debug app and the release app does not match when I upgrade app and change package name. I've wasted days checking package name then figure out the problem is the package name.

To get correct SHA-1 key, follow this S.O post, then use this key to create a new OAuth client ID for your app.