@Solla-topee Thanks for the response. Upon further investigation, it looks like the white wire bundle that I thought were the neutral wires are actually the load wires. This appears to be the wiring...

@MCavalch Did you by chance figure this out? My wiring setup is the same (only one box with neutrals) and I'm having the exact same problem.

I'm trying to wire the HS210 to one of the two switches in my parent's master bedroom and leave the other dumb switch intact. I'm running into an issue where the most I can manage to get is rapid...