Claimed new Elysium server, but not seeing it in plex?
If you have previously had an Elysium appbox, or if your appbox was re-deployed - Theres a chance you wont see the new server in plex, until the old is removed from "Authorized devices" within plex.
Top right, click your user icon and then "Account"
Remove all instances of "Plex media server" that you believe to be Elysium servers
Thats it! Claim your Elysium appbox again, and it should appear!