Hi Christian,
While the redirect looks OK it has not been edited for the correct client key.
The page you are on /oauth/v2/client/bcp is the test client for OpenID Basic Client Profile. This uses a hardcoded client key/id (5eed868e-7ad0-4172-88f2-704bcf78b61e) which is what you referenced in your screenshot.
5eed868e-7ad0-4172-88f2-704bcf78b61e belongs to the test client and you will need to modify the callback for it.
Now, I also see you are logged in as 'GLayer7' to OAuth manager. Since this test client is registered by the 'admin' user you will need to login as admin to view and edit the client. Hope this helps.
Regards,
Joe