Associating S2 on a Fibaro dimmer to a Fibaro RGBW controller

Hey guys,

I am trying to associate the second button (S2) on my Fibaro dimmer to control a Fibaro RGBW controller.

I have created a association (ID 2), but when I set it to control a individual channel (lets say red), then it won’t save (shows up as nothing assigned) and all the names are put back to “_Dimmable Light”

If I set it to control the master dimmer device in the RGBW controller (the one that controls all 4 channels at the same time), then it will show up as either controlling a device ID that doesnt exist, or it will select the “_Scene Controller” or “ZWave” device.

Any ideas?