@Wayne-TP it was happening within local wi-fi. I was adding the plug via Apple Home app, it was able to connect to my 2.4G wi-fi (the LED went blue), but in the Home app it never went out of "No...

Is this device is really compatible with Apple Homekit? I bought set of 3 from amazon, and added them easily to Apple Home (controlled by Apple TV4k v2). I also added them to Tapo app and they worked...