Unable to claim Plex library on Windows 11 pro server

Server Version#: 1.42.1.10060-4e8b05daf
Player Version#: 4.147.1
<If providing server logs please do NOT turn on verbose logging, only debug logging should be enabled>

I’ve had a Plex server for years and while there have been problems along the way, I’ve never been confronted with so many ECD (endless circles of death) before. I don’t have access to my libraries, even on the Plex server machine itself. When I hit the spanner there, I get the layer version of settings, not the server version. I tried using the “Setup Plex.html” and that goes into ECD mode, too. I’ve tried asking Claude and an Australian Plex-using friend for help, but we’re going round in circles, much like the ECD. Now that it’s stuck here, I can’t even get access to my account details or anything. Even the server and player version numbers are taken from screenshots of me trying to make it work.

Any help would be appreciated by this frustrated Plex Pass user.