I am currently running the following set up:
Tacx Vortex Smart
Garmin Ant+ dongle
When I pair through Zwift, I use the Stages as my power and cadence source and set Tacx Smart as my smart trainer. When riding I am not getting any change in resistance from the Vortex. It has been calibrated correctly. Is there an issue with the Ant+ I am using?
Same setup, except Imac Retina instead of Macbook, works for me. Can’t help more than that.
Had similar problem - make sure tacx vortex isnt connected to any other devices via bluetooth or Zwift cannot control it. That was at least the problem with mine.
I found that calibrating using the iphone would prevent Zwift or TR connecting to the Trainer, until the iphone app was killed and the pairing re-made with the PC program.
Trainerroad has it’s own spin down calibration that solves this issue
Be sure your firmware is 1.3.7 otherwise redistance wont work. Firmware can be update via an ios device