@david.laselle I’m glad you were able to link your device, and sorry that you then encountered another error. I can see the error in our logs and I will take a closer look as soon as I can.
There is also an issue that we are working on that can affect individual servers from time to time and causes the online player to be unresponsive to commands issued via the master interface.
The remedy (for now) is to click the “reconnect to a different server” button:
You might have to click a few times if multiple servers are affected. We track how many people have reported a problem with a server (via this button) and restart affected servers automatically.