I bought a box of 4 Kasa Smart Wi-fi Plug Slim. I've used them before with no issue. I've tried to install 2, and there's an error message they are not added to my Home. They show up in the Apple Home app, but not the Kasa app.  I want to program on and off times, but I can't do that from the Apple Home app.

any suggestions on getting the Kasa App to see my Kasa smart plugs?