Have you tried restarting the server?
Do you see it if you use app.plex.tv
Do you see it under Authorized Devices ? https://app.plex.tv/desktop/#!/settings/devices/pms
Does the web app have local network permission from browser? https://forums.plex.tv/t/important-note-about-the-plex-web-app-local-network-access/933264
