Hello i have an archer ax90 router setup at my home which has 2 WAN/LAN ports and 3 LAN ports. I currently have all the 3 LAN ports used by other devices such as my mesh etc. I want to connect a 4th ethernet cable to the wan/lan port that is unused on the router. However i cant get it to work unfortunately. Is it possible to use the unused wan/lan port as a LAN port? , why is it called a WAN/LAN port if it cant be used as LAN?