Oauth2 help for Google Proximity Beacon API


I am looking for some help in setting up oauth2 to Google’s Proximity Beacon API to edit beacons. I get to the point of being asked to allow Bubble to access my beacons, but after allowing I get an error saying the ouath2 isn’t configured correctly. I know my Client ID, Client Secret, Scope, Login Dialog Redirect and Access Token Endpoint are all correct, because I verified them in Postman first.

This is how I have it configured:

I’ve put the authentication in the login workflow as required and when I login I get this approval:

However, after allowing I get this error:

Does anyone have an idea of what the problem is?

thank you,