I have a 4 gang switch box that I am replacing 3 of the rocker switches with HS200 switches.  I have one main line coming from the breaker box.  I have started with just one smart switch and tested it and all went well fine until I tried to turn it off.  It will not turn off manally or through the app.  I suspect it may have something to do with sharing the three leads from the main line with the other switches but I am not sure.  I joined alll the switch locations to the main white lead, planning to install the switches to them.  On the one rocker switch I have the hot line going into ond out of the switch and then to the line leading to the light.  It works.  I split off the remaining hot leads to each switch location.  On my HS200 switch, both the black wires tie to the single hot lead and to the line going to the light.

If this thread is simular to another I apologize, but I searched conversations but did not see this particular problem.  Hoping the wisdom of the forum can set me straight!