Custom OAuth2 with ADFS fails(?) without error / no feedback
I followed this guide to configure my ADFS to provide OAuth-authentication for OSP. So far the basic communication seems to be successful, but I get no feedback from OSP after the sign in. If I enter a wrong password the login-form shows up again (the error gets detected), but when I enter my correct credentials the login-form gets closed and the browser returns to the /login-URL as if nothing has happened. When I click the "Sign in with oauth"-button again, the login-form doesn't show up anymore. It seems as if I am partly signed in. The logfiles contain no information at all.
I have no idea how to debug the problem. Has anyone successfully connected OSP with ADFS?