What you want to do is not possible with the Hue Gateway. The light color control for the Tradfri remotes is built into the Tradfri gateway, Hue can’t replicate this behaviour. What you can do is adding any other remote directly to home assistant and control it from there. However you will not get the smooth transition of colors and brightness easily if at all. For this you need deconz, ZHA or ZigBee2MQTT together with thsi awesome app
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