I see that is listed in the to issue in GitHub. There is the following comment there, that seems to address the issue:
I think I've solved the LAN connection issue for the POW320D. I set a static IP address and opened port 8081. I have two of these devices, and after restarting both HA and the...
Geewiz is much cheaper...
https://www.geewiz.co.za/smart-plugs-switches/215619-geewiz-ewelink-wifi-smart-plug-16a-south-african-power-ac-plug-socket-works-with-alexa-google-home-now-with-energy-monitoring-meter.html
It looks like you have ubiquiti network equipment. Make sure that the IoT WiFi SSID is 2.4 gig only. Also ensure that the setting "Enhanced IoT connectivity" is on.