I had a working Rails app with Auth0 -> Google authentication.
I was following the instructions to create production keys and did it as instructed. However Auth0 fails mysteriously with “Unknown client” error.
As it all seems correct I turn back to Auth0 with the error:
Unknown client: XXXX-XXXXXX.apps.googleusercontent.com
where XXXXX-XXXXX is the client ID I got from Google Developer API generated as per the tutorial.
Can anyone shed a light where the problem possibly is?