Switch on/off knx dimmer


I searched all topics on KNX app, but cannot find a solution for my maybe simple problem.

I have installed KNX IP interface, homey-pro can find it. I have loaded my ETS project, and Incan select all my devices and addresses.

I selected all the right addresses (also from my Domovea application) for switching on/off status, dimmer status, etc.

When I physically turn on the light, I can see in Homey it is turned on. Also when I change the dim % it is shown in Homey KNX app.

I can only not switch the light on or of, or change the dim % via the KNX app in Homey.

Should I use another group address then the one for the device (light) ?

Hope someone can help me further.