Well I already have jellyfin running in a container, just have to figure out how to get mum's TV to work with it I guess
log in on a local IP and not the network name and it's working again. but I'll be moving to jellyfin from now
Also the weekly intentionally misunderstanding how Plex pass/Plex remote pass works in order to complain:
Free to Use: Video (movies & TV) streaming of personal content on the same local network as the Plex Media Server