The switch will turn on with app and sometimes off after a delay.

When manually triggered by the dumb end or the kasa the indicator light with change briefly then comes back illuminated.     The manual press and flip does function the actual circuit on and off.

The travelers are 75 ish feet long. 

It will not function reliably with the app as the app doesn't see it as on,  so my group off trigger doesn't work.     Night does anytime style 

I have reset, restarted , repaired,  

I have not tried a second unit at this location as it was my last one to be installed.    I also have not tried a second at the dumb end.