Flutter and google_sign_in plugin: PlatformException (sign_in_failed …

Navigate to the google api console (currently at https://console.developers.google.com), make sure you are logged into your account which your firebase project is created under. Select your project from the “select a project” dropdown in top left of the developer console.

https://stackoverflow.com/questions/54557479/flutter-and-google-sign-in-plugin-platformexceptionsign-in-failed-com-google