Carl,

Thank you for your reply. If I am understanding you correctly, you are saying that you swapped switches and put the HS210 where the mechanical switch was and put the manual switch where you had originally placed the HS210. Is this correct?

I will try this and see if that resolves the issue. I tried putting more load on the circuit by replacing one of the low voltage LED bulbs with a 100W incadesent bulb but it didn't help. I will try your workaround tomorrow.

Thanks,

Larry

I was having some strange issues with the app not showing the status of the switch correctly.  They had me delete the app on my phone and then reinstall it.  Once I did this the status shows correctly both in the Kasa app AND in Alexa.  When you install the three way with mechanical switches it is best if you install the HS210 so it is the first switch in the circuit.  What I mean by this is that the power from the circuit breaker hits this switch first.  Best way to figure this out is to turn the power off and disconnect all the wires from both switches (being careful to label them all).  Then stretch the wires out so they are not toughing anything.  Next turn on the power and then with a non-contact voltage tester go to each wire and find the ONE that is hot.  That is the location where you should install the HS210.

Larry, I think what Carl is actually saying is to toggle the mechanical switch to the "other" position. i.e., if it is up put it down or vice versa. That's my reading of his post.