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I have a Computrainer plugged in via its funky USB adapter and a Garmin USB receiver that talks to the powermeter. I don't actually know which one of these it was 'using' at the time. Never really though about it - I just adjusted % on-screen until my head unit was where I wanted to be. I think I'm going to stop my subscription now since I don't need Zwift to tell me how far through a 2x20 I am.
Were you using Bluetooth or ANT+ to connect to things?