A friend is also having problems with a new install. Took a look last night, reinstalled and tried everything i could to get it running happily but ultimately failed.
From what i remember when i installed things a month or so ago, i started the container, navigated to the GUI, logged in and was greeted by a fresh server to config.
My friend did the same but after login was presented with his current plex server. Nothing we did was able to initiate a new server setup within the plexpass account. I don't have logs to hand, but will be trying again tomorrow night.
Is it possible to install an older version of the container?