Tacx Vortex no watts when pedallung

Hi, I newly joined Zwift and tried to connect my Tacx trainer. However, I am not seeing any power / speed / cadence when pedalling - I do not start moving. The app found my trainer, the connection looks good, it seems it’s just the data transfer issue. I have the same issue with Tacx app. Any tips how to solve it? Thanks a lot! Lucie