I have created a new project in Google cloud console to experiment with Google OAuth flows. I have therefore set up OAuth web app client credentials using
APIs & Services -> Credentials -> Create Credentials -> OAuth Client ID -> Web Application
I want to be able to experiment with postman to request authorisation codes, access/refresh tokens etc. Once in the Create OAuth client ID I therefore add a postman callback URI (https://oauth.pstmn.io/v1/callback) to the credentials' Authorised Redirect URIs as described here. However when I click CREATE at the bottom of the Create OAuth client ID screen, the screen does not update and just keeps spinning. I have waited for over 20 mins but to no avail. Is this a callback URI validation problem such that Google won't allow me to add this redirect URI to the credentials? I have tried to add the domain oauth.pstmn.io to the authorised domains in the project settings but to no avail. When I don't include the redirect URI, the credentials are created with no problem and I am returned to the main APIs & Services -> Credentials screen.
The user that I am using to make these changes owns the project and therefore I do not suspect it is a Google user permissions issue. I have also added the minimum number of fields (project name and support email) to the OAuth consent screen settings. I have also tried this whole process logged in on a different machine.
