Shelly rgbw2 in openhab3 with binding

Good evening together,
I wonder if anyone has successfull integrated an shelly rgbw2 in colormode in openhab 3 via the shelly binding.

This is my thing-file:

Thing shelly:shellyrgbw2-color:af3c45 "Sideboard TV"   @   "Wohnzimmer" [deviceIp="", userId="", password=""]

This the item-file:

Switch Sideboard_Power "Sideboard TV" <ligth> (g_licht_OG) {channel="shelly:shellyrgbw2-color:af3c45:control#power"}
Color Sideboard_Color "Sideboard TV" <ligth> {channel="shelly:shellyrgbw2-color:af3c45:color#hsb"}

and this my sitemap entry:

Switch item=Sideboard_Power
Colorpicker item=Sideboard_Color

I’m able to switch it on and off via the app. If I want to change the color nothing happens. The Log say that the color values have been chaged.
´Does someboday has any ideas?

Many thank in advance…