Is the Plex Server you are having issues with the Command Line interface returning results in part of a Plex Home?
I am seeing the same results you are seeing when attempting to execute any of the Plex Scanner Command Line (vs Plex Server URL Commands) commands such as “Plex Media Scanner.exe --list”. Here is the link to my post describing my issue:
Scan/Refresh Directory via Command Line (Plex Home Server)
My Plex Server is part of a Plex Home and I think the issue has something to do with the need of an authentication token for the Plex Scanner Command Line interface similar to what is needed for the Plex Server URL Command interface. Basically, I believe all Plex Scanner Command Line calls are silently failing with “access denied” similar to the “401 Unauthorized” response on the URL Command interface if a valid X-Plex-Token is not provided.
Is there any way that you can confirm/deny my hypothesis?