My SONOFF devices are nor visible nor detectable when trying to pair them with eWeLink control app. Thi is extreemly enoying!!!!

I have been reading the threds but this problem I had a year ago using TP link Deco WiFi solution.  Back then we came to a conclusion that WPA protection was an issue. The router has ALWAYS been signalling WPA3 support regardless what setting has been choosen. When I disabled WPA protection the devices where detected installed and where communicating with eWeLink cloud without any problems. SONOFF devices where getting confused sinc no support for WPA3 and woud misscomunicate. So it is issue of both TP Link and SONOFF.

Since I did not wanted to use internet without protection the only choice I had was to change to ZTE router. Now this I do not want since I have a big house and use Deco Whole Mash. I took my Deco`s back and since there has been at least one SW update and TP link and David new about the issue that it has been fixed. 

Today I tried to install my HVAC controlling devices back and they are not even detectable. I switched 5GHz OFF, I dissabled WPA compleatly and nothing. Many people suggested that but eWeLink has compatible mode where they support 5GHZ wifi as well in registration procedure. I have not tried again with other router. Will do it tomorrow with the phone and hotspot.

Does anybody inclusive TP Link have a clue wht the problem is???

Br Dean