Trying to sign up to this forum using the Google button fails:
The redirect URI in the request, Hologram Support Community, does not match the ones authorized for the OAuth client. Visit https://console.developers.google.com/apis/credentials/oauthclient/30723006179-3obp9i5048coijrsprutae2ig9qe60j8.apps.googleusercontent.com?project=30723006179 to update the authorized redirect URIs.