Commercial Electric Smart Plug Can't Set Up

Thanks for the suggestions, but they didn't work.  However, as I was trying them, I noticed something that I hadn't tried yet.  I saw that the security for the 2.4 ghz band was set to WPA2-Personal[AES] + WPA3-Personal, and I wondered if maybe I should try setting it to just WPA2-PSK [AES] so it wouldn't attempt to use WPA3.  Once I set this and rebooted the router, I was finally able to add the plug, with all that other stuff set back to where it was originally.  So none of the beamforming and MIMO and AX settings affected it, just the security for the password.  Now, it's possible though that some of that stuff may still make a bit of a difference as the response to the plugs is very slow!  The router isn't that far from them and not through many walls.  I'd say within about 20 feet or less away.  But it does work.  Hopefully this might help someone else if they have the same issues...