Oh damn, I mixed up the WAN with the LAN that connects to the satellite router. I redid the faulty cable end and it worked! Thank you @woozle !

@Leandro_Sampa

I have two Archer 53 units running an EasyMesh network. I configured the satellite as a router and connected them via cable using both the LAN and WAN ports, but Ethernet backhaul does not work. In...