I believe that the client registration should be able to use the BearerHeader client_authn_method for simple authentication.

However, if configured to use it, it never checks the token as there is no get_client_id_from_token method implemented in oidcendpoint/oidc/registration.py. The method is called here

As a result it returns "" and no exception is raised.

I tried implementing a get_client_id_from_token method similarly to userinfo's one, but then there's a problem with unauthenticated registration as the No token exception is raised, because it cannot find a client_id in the request (correctly) and there is a get_client_id_from_token implemented. I think the last check should be corrected.