Niko Home Control II - I cannot get my Digital black to connect to my Wifi router/Accesspoint, what is wrong?

The Digital black’s Wifi interface is of type Wifi 2,4 GHz bgn (HT20) and it only supports WPA2 networks with PSK.

This means that it does not support WPA3 nor Enterprise networks.
Check your Wifi router network settings and change the Wifi Protected Access Protocol to WPA2-PSK.
If another protection protocol is mandatory for other reasons, you can create an extra Wifi network with WPA2-PSK protection settings and connect your Digital black to that one.