Question about Velux Active

Velux Active uses IO Homecontrol as the transmission technology, whereas Netatmo uses WLAN for transmission. If you want to reconcile these two technologies, you need a central control system that understands both. Apple Homekit can do this, for example, or alternatively a Somfy central control unit with Somfy thermostats that also understand IO Homecontrol.
I myself have set up Apple Homekit on an iPad as a central control where both Netatmo and Velux Active products are compatible...among many others.