When cycling zwift on apple tv there is no spindown or calibrate power option in the pair devices screen.
what trainer do you use?
oddly, I had no issues connecting cadence,power,heartrate, so more then 2 bluetooth datastreams! with apple tv, probably the bushido sents data combined. But sadley I see no config/tool next to power device to calibrate. Not in compangnion app and not in apple tv Zwift - connect devices
If your Bushido have a calibrate app then rather use that. You don’t have to calibrate in Zwift if you do it in the trainer app.
But then I have to stop zwift on apple tv, because I cannot connect to both apple tv Zwift & Tacx Utilty to calibrate. I’d rather do it in game, after 10 minutes warming up the mechanics.