Plex not discovered automatically

I have finally installed HASS, running in a docker container with the --net=host I have a plex media server running on a different machine but the same network. On the same network I also have a Sonos Play:1 and Apple TV which are both automatically detected, but not the Plex server, where GDM is enabled.

Any ideas?

You could always try specifying in manually in the configuration.yaml. If you get any errors after specifying the IP and port there, at least you’ll have more info in the logs.