Test OAuth v2 endpoints

[CarinaWolli]

Test endpoints before changing the docs to point to the new endpoints

Ensure these endpoints follow oauth2 standards

When ready, change docs to new endpoints

[linear]

CAL-7090

[ame2en]

hi @CarinaWolli can i work on this
need some more context about this issue

[CarinaWolli]

This will be picked up by the core team. It's a sub issue of: #25636