Thanks for including the versions of DSM & Plex Media Server.
For claiming to work, Plex Media Server must be able to communicate with systems at plex.tv.
As a quick test of Internet connectivity, make sure the NAS is synchronized with a public NTP (time) server.
- Login to the NAS → Synology Control Panel → Regional Options → Time tab
- Select Synchronize with NTP server, pick a server from the list, and update.
- You should see Status: Normal.
After that, follow FAQ 31: Reset / Reclaim PMS on DSM 7 (Not Authorized - Locked Out).
It will have you uninstall, then re-install Plex Media Server. During the re-installation you will use a claim code from plex.tv/claim.
If that does not work, report back with the text of any error messages that appear.
Also include a set of Plex server log files. To manually retrieve the files:
- Using Synology File Station, navigate to the Plex Data Folder (/PlexMediaServer/…)
- Right click on the Logs directory and choose
Compress to Logs.zip
. - Download the zip file and attach to the thread.