@Frostbyte 

I see.  So That isn't a 3-way but a 3-DIMM.  Sorry, when I saw you say 3-switches controlling I thought you were referring to a setup that has multiple switches that control the same lights.  

For this setup, it is likely just 3 regular switches.  My engineers did get back and they indicated that this error occurs when the APP fails to request device information.
Generally speaking, the request failure may be caused by the offline device or the poor mobile network. I can't really say if this is the case or not.  What I can do is tag two very knowledgeable community users @B.Will  and @DEcosse.  Both of these users are very knowledgeable about electrical and switch setups and have provided me with assistance in the past.   Would either of you be able to chime in on this concern?  in summary, the switch box appears to be a Single-Pole with a neutral, ground and line, and load wires (1 black 1 red)  Frostbyte tried to install one of our Kasa HS200 Single-Pole switches and was getting a Java error, which my engineering team indicated the app failed to communicate with the device.  If you can please look at this thread along with the information Frostbyte provided and see if you can think of anything electrical that could be causing the concern.  I would just like to rule that out and you two are far more versed in this than I am.  

@Frostbyte  It could be a network issue at the location.  to test that put your cell phone on 2.4GHz and then stand next to the switch.  If your phone has a poor signal that could point to this being a communication issue. Lastly for that right switch, if its like the wiring at my home that switch is actually tied to a outlet in that room and turns that outlet on and off.  Here in Henderson those outlets are upside down to show which ones are controlled.  In California it was a trial and error, but if nothing happens when you pull that switch that is likely what it controls.