Another addition as info:
On the old shared hosting, the domain we used for it had an let’s encrypt cert for the login domain. The domain wasn’t transferred yet, does this maybe affect the login?
Did you also used the exact docker version for the restore of your database?
You should restore it first to the same version and than update to the version you wish to end with.
Yes, I did, first I installed it on 2.0.3. as docker. After the login page wasn’t available, I updated to the latest v2 version to check if it will resolve the issue, but it didn’t
I will try to use an ssl cert, maybe that is the reason why