I had the password issue back in the day when I uninstalled and reinstalled immich. At that time, my solution was to uninstall, remove the folders created for it, and then reinstall. That way it started with a clean slate and was able to set the password for itself.
Given that installations, or at least updates, are a bit broken in general at the moment, now might not be the best time to sink a lot of effort into this. But the errors listed in this thread so far do not seem related to those issues, so I guess there might be hope.