I’m encountering a similar issue trying to interface with an API from Adobe. In my other applications (incl. Postman), I’m successfully using grant_type client_credentials with the need for an auth URL or login.
If I tried to use an auth URL provided by Adobe, I got the following error:
Does that mean I’m not capable to integrate with that API? Is there no way to modify the security schema to enforce client_credentials as grant_type?