3 way switches have always worked for single pole circuits going back 100 years. Smart switches are not unique to this. It's just completing a circuit. It's not "outside of the intended use of the...

Update... I just added the spare HS210 switch to a single pole circuit and added it to Kasa as a new switch and everything works perfectly. I have no idea why a TP-Link Support employee would...

Another... https://www.reddit.com/r/homeautomation/comments/9x7amw/splitting_up_tp_link_hs210_switches/

Then how are people making it work? After posting, I've found even more posts from people who've done it. Even several Amazon reviews of people who used the HS210 on a single pole. Here's just one......

I got a HS210 Kit for a 3 way setup but one of the switches had no common so I couldn't install it there which is no big deal since they work fine with just one. I've read that you can use the HS210...