Well, from our audit log, you did delete a lot of devices, including your server on 2024-09-16, so it’s no longer attached to your account
Another thing you could do is follow the QNAP FAQ Q28
Than should give you access to the Preferences.xml file via QNAP File station
Then follow this: https://support.plex.tv/articles/204281528-why-am-i-locked-out-of-server-settings-and-how-do-i-get-in/
