I have a few suggestions:
- Open https://app.plex.tv
- Settings (upper right) - Authorized Devices (far left) - Servers (dropdown)
- If your synology is listed there, remove it.
Now return to the Syno and we’ll start over
- Uninstall the package
- Control Panel - Users - Delete user Plex
- Control Panel - Shared Folders - Delete the Plex share.
- Restart DSM.
Here is a How-To, with step by step, which should take all the pain out of first-time setup & learning your way around the basics of using Plex on Synology.
