@Electroman please note my diagram carefully - you need to also make changes at the 3-gang box for the HS210 connection

Electroman wrote Am I correct that the wiring for the HS210 in the 3-gang box is currently correct then? and the issue is in the 1 gang box because I technically do not have a neutral? @Electroman No...

@Electroman This is what I THINK your wiring is on that circuit in question

@Electroman So if all the wires were indeed connected to the original switch at the single-gang location, then indeed that white is certainly a traveler. That centre switch is also a 3-way, but...

@surfinmaverick All I can tell you is what I already stated in my last post - whether a switch is Smart or Dumb, electrically as a 3-way, it does exactly the same thing directing power from the...

@Electroman Where does the red wire go on the other 2-gang box? Since you only have that one Romex in the first box, I suspect that the white is not actually a Neutral and is the 'other' Traveler...