No WIFI WAN on SOHO Mk3

I am trying to setup my SOHO Mk3 as a range extender for my BR1. I need to have my BR1 on one side of my house to connect to an antenna.
I thought I could just set up my SOHO Mk3 with WIFI WAN but all the health checks fail.
The signal strength is sitting around -45dBm

I am new to this fancy equipment and am unsure on how to troubleshoot. Any help would be appreciated.

To connect 2 soho’s I just change one to a different IP address such as 192.168.51.1