The problem you describe can be caused by networking issues. If PMS cannot communicate with hosts at plex.tv, then claiming will fail.
- Reboot your router and wait 2 - 3 minutes for it to fully restart.
- If you’ve a VPN on the NAS or router, disable it (so Plex is not tunneled through the VPN).
- Verify the NAS IP address & mask, and default gateway are correct.
- Configure the NAS to a public DNS server such as 1.1.1.1 (Cloudflare) or 8.8.8.8 (Google)
- Sync the NAS with a public NTP server (Control Panel → Regional Options). If the time is incorrect, claiming will fail.
Then reboot the NAS, start PMS (if stopped), and try to claim the server.
When claiming, point the browser at the IP address of the NAS. For example, if the IP address is 10.1.2.3, use https://10.1.2.3:32400/web. Do not use QuickConnect, a FQDN, etc., as claiming will fail.
If that does not work, then uninstall PMS and re-install using the Plex Claim Token option. See FAQ 31: Reset / Reclaim PMS on DSM 7 (Not Authorized - Locked Out).
If claiming still fails, then time to look at the log files. Stop PMS. With File Manager, navigate to the Plex Data Folder. Right click on the Logs folder and choose “compress to logs.zip.” Then attach the file to the thread.
