Immich isn’t the easiest docker stack ! I will up it on my own server and give you some feedback.
Because their isn’t any network configuration in the compose it uses the default docker network. Thus… maybe… it overlaps with your own network, that’s what your first post was about :)
I will look into it and if nobody comes up with an anwser before me, will give you some feedback on how it went and try to find out what’s wrong !