@Kevy Go to router settings. Go to WiFi. Click on your network name and there is an option to turn on WPA3. Some of my devices did not with WPA3. So I use the guest network and left WPA3 off. Those...

@Okapy Turn on WPA3.

@TP-Link_Deco I had the problem of the master connecting with 2 and 3. I wanted 2 to connect with the master and 3 to connect with 2 because of the week signal on 3 as a result of the distance of 3...