Users and Groups are not synced. Users will only be available after first login of that user. Groups itself are fully managed within the app itself.

I think this is some docker issue. We see the same issue in our CI and also reported in the Mirotalk threads. Reinstalling fixes the problem as you already found out

An, I had it installed when they weren’t there (?)

yes, the app containers can't connect to private network internal IP . Turns out this is not true, I am able to connect . You might have to use the internal ssh port btw and not the public ssh port .