I recently have a Van Rysel D500v2. The issue is that everything seems to work but the speed.
I also have the last version of zwift. Anyone have the same or similar issue?
Assuming you paired the trainer as a power source, speed in the game is derived from power. So if speed is wrong, that means power is wrong. I haven’t used that trainer but my understanding is that the OneLap Fit app will allow you to calibrate the trainer (assuming it works like a D100) so that is one thing to try.
To understand if the trainer is measuring power with reasonable accuracy, you need a second power meter you can compare it to. That would allow you to record power from two measurement devices during a single activity and see if they are close.