@David-TP Thanks for the help

Update - After changing security to WPA3 personal and rebooting all Decos, devices connected after a while. No device is connecting to first satellite though, they either connect to main Deco or...

Deco X20 3 pack, all showing stable green light. Main Deco is placed near wall, first satellite is 12 feet away about 4 feet higher and second satellite is on the floor above. Problem 1 - The first...