I have a stackoverflow account for many years but I don't manage to log into this community. When I press "Join this community" it says "completing login to Area 51" and the UI looks as if I was logged in, but then when I go to e.g. https://area51.meta.stackexchange.com/questions/32892/what-i... it says "You must have an account there to participate." and I can restart with "Join this community".

I also did the "commit" dialogs, even twice, but nothing changes.

Any hints?