Moved Plex hdd from Win10 to a newer windows 11 cpu, now not able to see my previous Friendly Name

Server Version#:1.42.2.10156
Player Version#:
<If providing server logs please do NOT turn on verbose logging, only debug logging should be enabled>

What is the “Plex hdd” for you?
The drive with your media files?
Or the drive which holds the Plex data folder?

https://support.plex.tv/articles/201370363-move-an-install-to-another-system/

Plex media files, the Plex data folder is on the windows 10 start up drive

The friendly name and other server identification data are stored in the Windows registry.
If you don’t have a backup (and cannot access the old registry) then you have no other choice than to create a new server identity.