First let me start this out by saying I'm a licensed electrician. I bought 2 of these kits to use on my living and kitchen pot light circuits. Installed everything and threw the breaker, lights came on good. Both the smart switches at either end functioned properly, but the 4 way in the middle wouldn't do anything. Checked it with my multi meter and found that both travellers coming from my main kasa had 120v on them. So the 4 way would only flicker the lights but couldn't kill them since both legs had juice. Switched everything out for regular 3 ways and it works mint. Hoping tp link can give me insight on how if possible to make this work.