I am unable to connect my TP-Link EB810v router to the TP-Link TL-7DR5160 (BE5100) router with latest 1.0.8 firmware, latter as a slave node.

How can I get them to link up in Mesh mode?

I pressed the EasyMesh button on the BE5100 router, then click the Add Mesh on the BE810v web console, nothing happened.

Both claim to support EasyMesh 3.0

I had connected a LAN cable connecting both unit sserving ethernet backhaul, nothing too.