I'm running my main PMS on my Linux server. Everything (regarding this topic) is fine. As soon as I start my second PMS (different server) I cannot find my main PMS anymore.
If I access plex.tv/web I only see my second PMS
If I access IP-of-2nd-server:32400/web I only see my second PMS
If I access IP-of-main-server:32400/web I see my main PMS and second PMS
Main PMS is called PLEXTOR, Second PMS is called NAS
I also tried it using Plex on Android and Plex on FireTV 4K.