Yeelight dimmer compatible with Yeelight Spotlights???


I have several Yeelight Spotlights. To operate these lamps I have the Yeelight gateway. I can turn the lights off and on via the app.

Now I have bought the Yeelight dimmer below for these lights. Unfortunately, I can’t get this dimmer to work with my Yeelight spotlights.

I have followed several tutorials, youtube movies but unfortunately no way I can get it working.

What am I doing wrong?
Or is it just not possible to connect these Yeelight spotlights to the Yeelight dimmer?

Thanks in advance!

Yeelight Dimmer, Yeelight spotlights, Yeelight gateway.