OAuth error when logging in

[Florian Sabonchi]

Hello I would like to integrate OAuth in PG-Admin. Unfortunately I have 
the error that I am redirected back to the home page. Unfortunately I 
could not find this error, what surprises me is that 
current_user.is_authenticated is set to True. For this reason I just 
wanted to ask maybe someone knows what the problem is. You can find my 
source code here:

https://github.com/FlorianJSa/pgadmin4/blob/OAuth2/web/pgadmin/authenticate/__init__.py

I would be very happy if someone could help me with this problem. 
Because I unfortunately have no idea what this could be for an issue