Newly created Oauth Client IDs don't work

Question

I created a new appengine project, which creates a default web app and associated client ID. When I try to use this client ID, I get "invalid client ID".

Answer 1

This looks like a bug in the cloud console.

To fix, I created an additional web app, which creates an additional client ID of the form 123456-randomness.apps.googleusercontent.com

The secondary client ID works.

When I go back and try the original client ID, that now works too.