Stop using Chrome! Download the Brave Browser via >>> [Brave.com]
It's a forked version of Chrome with native ad-blockers and Google's spyware stripped out! Download for Mac, Windows, Android, and Linux!
I may have similar problem. I have been running Plex on Win 10 for long time. I am making dedicated Ubuntu server now. Leaving old box running until I get new one working so I've installed PG.
When I log into Plex, I see my old server but it acts as though the new machine is Plex player and not server. I cannot see new server listed in drop down and i cannot add local media from the new box. Also if I look for it in Tautulli on the new box it says not a Plex server. I know you can run two servers, what have I done wrong? Thanks.