[solved] Email list view empty after upgrade 7.12.12 to 7.14.0

I updated from 7.12.12 to 7.14.0, switched to PHP 8.2 and tackled some issues with IMAP and SSL ( domain name to certificate CN mismatch).
Now I see the emails getting fetched (can see that in the email table in the database), but when I go to the Email Module I get no more list of Emails but an empry page with just the filter section on the top.
I think there was some discussion about that at some time, but I was not able to find it.
So how can I (admin user) see the group email inbox?

Found that I had to acitvate the mailbox in my profile.
This topic helped me a lot understanding it: Does anyone have group emails working for users?