I am trying to get my AX4400 to work. I changed it's location to get better signal to devices. Prior to moving it, I had the cable run from my modem into the WAN port on router. I then connected my Ethernet switch to one of the LAN ports.  I moved it to a location that has an Ethernet cable that's run off the Ethernet switch. So the current connection is modem to Ethernet switch, then Ethernet switch to router WAN port. WiFi will not work in this configuration. Not sure if there's a setting that can be changed?  I've connected a laptop to the cable that feeds the router now, and there is a good connection. For whatever reason the router still won't work...