You need to connect Tacx Neo, Bushido, Flux or Vortex via bluetooth. These trainers work really well.
Even if you have an ANT+ Adaptor, only use it to connect to a heart rate strap. The trainer will handle power, speed, cadence and automatic changes of gradient. We strongly recommend connecting to FulGaz via Bluetooth whenever possible.
The other possibility is your firmware is not up to date.
IMPORTANT: The Tacx Satori Smart does not work with FulGaz. It uses a non-standard way to send it’s bluetooth signal and we can’t calculate virtual power from it because we don’t know what lever setting you have used.