Warning, do not revoke a device on the nest network. There is a bug that will remove all nest devices. This just happened to me. If you look at forums or contact customer support no one will help you or act like it's a problem. You will have to rebuild the whole network scanning each device in again. Make sure you take pics of the pin and serial on the back of all your devices. I had to go around with a ladder and uninstall everything just to scan the QR cod on the back or get the pin.