WIFI roaming with wireless connected router

I have 2 routers (r6900v2 chaser and dir882a1 lead), connected via wifi.
Used Connect to client Wi-Fi network this instruction. One sub-net.
I have been configure usteer and dawn. But this works separated on each one, not together.
How to fix it?
Which additional information I have to share ?

I just needed choose "wwan" instead "lan"

Usteer sees other APs with roaming at Usteer's tab, but roaming not works.

Are you saying that you're attempting to simultaneously connect two upstream AP - both of them having the same network IP addressing?


Maybe you should explain the goal of your setup.

I need to connect routers via wifi.
Instead Connect to client Wi-Fi network this, i choose mesh. At the same time I set up Roaming.