Hi!
I was able to reproduce the issue, and fix it. I uploaded the hotfix a couple of hours ago to the server.
Interestingly, this error is not related with the server migration. It was only a coincidence.
Please, reset your thermostat by searching the nodes again. Then it should work. In worst case, you will need to logout and login from all your connected devices.
Let me know if it worked or not.
THanks.