If you are unable to generate an admin token, it is because you have changed the default Server Admin group name or accidentally deleted the Server Admin group (we know it happens).
Due to the way Clanforge works with TeamSpeak this group name cannot be changed as it will cause this error.
You can fix this by resetting your TeamSpeak to default.
This can be done via Clanforge -> Manage voice comms, switch the server to Mumble, saving, then switching back to Teamspeak 3. This will reinstall your service to a fresh state.
You can then generate a new admin token via Clanforge -> Server Name -> Admin token and use this inside the Teamspeak Client -> Permissions -> Use Privilege Key.
Otherwise, you can contact our support team who might be able to work some magic and create a new Server Admin group for you.