CATCH-22 Cannot add libraries to home screen after logon

Plex Media Server
2

Mentioning the server operating system would be helpful.
If it’s Windows, see

  1. Important note about the Plex Web app - Local Network Access
  2. https://forums.plex.tv/t/you-need-to-reclaim-your-server-but-dont-dare-to-touch-the-windows-registry/809720/1