Hello, A year ago I was struggling just like everyone here....
I tried to connect with the samsung S10e phone through the router at home to no avail, I set up the same network on the other phone and after hard attempts I succeeded.
Today I tried to start the app and it logged me out and I couldn't log back in. The fun started from the beginning...
- the option from that year did not bring any effect.
I did this:
- in the router on the 2.4G network to which the phones were connected, I set WPA / WPA2 Personal, operating modes n (I do not know if it contributed to the connection of the device)
- I connected the phones to the same 2.4G network (older and newer phone)
- I reset the Wi-Fi in the air conditioner by pressing HEALTH 8 times and after a few seconds on the Xcover4 phone (older phone) I gave connect or send the password to the unit (he found the unit without a problem and connected)
- I logged in to the S10e and the air conditioner added

To sum up, I was unable to connect on the Samsung S10e phone (newer generation wifi only on Samsung Xcover 4 old dead