@prixone Thanks for your help.
For all who might have similar issues. The logs weren’t very forthcoming. I only got weird smybols in the Browser.
Then I installed it anew which worked. Then step by step enabled the same settings.
In the end as I then suspected it has something to do with my via certbot from letsencrypt created certificats.
I still do not know what but I will figure this one out hopefully somewhen soon.