Lost admin rights after updating linux server, privilege key cant be used again, how to regain rights?

I’m running free TeamSpeak3 server 3.12.1 on my VPS (Ubuntu 20.04). After an update (untarred new version into same directory) I have lost admin rights to the virtual server. All options are greyed out. Same thing in the permissions menu, I’m simply a guest now. Presumably because I have overwritten all permissions.

Tried to get admin permissions by using the privilege key, but that doesn’t work because it was a one use only key. How do I get control over the server back?

7 posts were merged into an existing topic: I accidentally removed my server admin