Tacx Vortex not working


Just bought a used Tacx Vortex 2180 and cant get it to work with Zwift. I manage to connect to Zwift on either my iPhone or Mac with Bluetooth, I connect it as Powersource and it also connects Cadence and Controllable. For some reason when the race/cycling screen opens, my avatar doesnt move and my speed stays on 0 (despite me pedalling hard!). I previously tried connecting to the Tacx app and a similar thing happens i.e. The Tacx app connects to the Vortex, but when I try and calibrate my speed just stays on 0km/h. Any help is much appreciated.