I use Zwift Hub with Apple TV and connect it to the Apple TV using the companion app. When I click the wrench to perform a manual calibration, it just keeps saying, waiting for device, or something like that.
So I can never do a manual calibration, any ideas as to why?
But I would assume since you are using ATV you are using Bluetooth. Bluetooth can only connect to one device at a time, try calibrating when the ATV is turned off.