Issues setting colour for Warm/Cool Magic Home bulb

[honestdan]

We have a standard RBG strip, and then we have an RGB bulb that has the cool/warm option (when we interact with it via the app).

Running the same code for both strip and bulb, they both turn on / off fine, but setting the colour doesn't work for the bulb (but does work for the strip). I've debugged it and the RGB value is being set for the bulb as expect, but the light isn't actually changing colour. We have tried calling refresh on it after changing colour. We have tried calling SetColdWhiteAsync after setting it to a different colour on the phone app, and it doesn't change either.