No permission on Sinology Server

You mention 3 problems

  1. No access to the server ( access denied )
    – Reset the credentials using the Plex Claim Token
  1. Permissions for Plex to see your Music library.
    – The username to grant permission is PlexMediaServer. User Plex is not used in DSM 7. You may remove (delete) user Plex
  1. In event you have Plex icon not visible on desktop, you can restore it with -