I'm having trouble with only one switch trying to control another light. The switch I am using is an Inovelli Red series dimmer, LZW31-SN. It is connected only to line and neutral wires. I am using a Hubitat C7 hub. I want it to turn the light of an Inovelli Fan+Light LZW36 on or off.
In Hubitat I used Rule Machine to create a rule for a button 1 push to turn the fan's child light to 100% and a second rule for a button 1 held to turn off the light. It was working for a while and then stopped working. I could push the paddle to turn it on, but nothing would happen. Likewise, I would go into the room, turn it on from the fan/light switch and then go back out and the red dimmer wouldn't turn it off. However, if I turned it on and off from inside a few times the red dimmer would start to work again for a while.