I have set up a Livarno Lux LED light strip in hubitat and it works as it should with colour and other options however when pushed through to homekit i cannot change the colour. The colour selection options appear in homekit but only temperature and on off actually work
I wish I could help. I've had no luck getting any of my color bulbs to work right with homekit. It might be a bug with the color picker in the home app. It shows a UI like I should be able to change colors, and some default color options. But when I try to change the color, it seems like it just wants to change the options, not the color of the bulb. And every once in a while, the color of my bulb will change, but not how I wanted it to.
On the other hand, if I ask my Alexa to "change the lamp to blue", it works every time. (Which is why I've leaned towards it being a homekit problem, but I don't really know.)
Are you using the system HK integration or something else?
I believe I have shared a color device via Homebridge and gotten it to work in the past. Have never tried using the newer built in HK integration app.