Like so many others in the UK I bought some of these bulbs and sure enough ZigBee RGBW Driver. Once I allowed Alexa access to the device then from within Alexa on the iPhone I can alter the Colour ( actually brightness) from Warm White down to Cool White.
Using the panel below I can turn the bulb on or off, using Alexa I can also control the on off function.
Selecting any colour makes no difference to the lamp.
Within Hubitat on the latest build This is what I see when I try to setup any changes, between each stage I dutifully press the button to save the entry.
When I "Save Device" all settings are removed and the red lines appear once more as shown below.
With regard to the function of the Dashboard, I anticipated being able to toggle the light on or off but that's not possible, the image below shows the "Button"
Activating the button only opens up the panel shown below where of course I can alter the brightness and turn of or off but again no colours
Within the dashboard panel configurations I set it like this
Any thoughts appreciated