Zwift and Trainer stays on tension

zwift and my flux2 tacx trainer arent working together well, the tension stays the same on my trainer for the whole ride. I have updated the trainer, zwift and my macbook pro. What else can i do? Trainer is always under tension even down hill. MacBook Pro, Zwift and the trainers software are all up to date.

How do you pair the trainer to the Mac? Bluetooth or ant+?

bluetooth its always worked fine before