Ionic & Google OAuth for mobile app and web site

The solution seems to be a change in the API's client id. Until now we've been using the full id, like this

1234567890-abcdefghijklmnopqrstuvwxyz.apps.googleusercontent.com

However, if we changed the API to use only the 1234567890 portion it accepted both the web and app clients, with of which are using their own IDs.