WAN Port - Cant connect to my router (not pepwave) via the WAN interface on my Pepwave

Hello all,
Looking for some guidance regarding my setup.
LAN - LAN Interface
WAN- WAN Interface via DHCP GW
Router IP (not pepwave)

I can ping the router IP,, from a host on the LAN side,, of the Pepwave
However I cant SSH or HTTP/HTTPS to the router, (not the pepwave router)
When I do try to browse to the WAN router,, I get the Pepwave admin login.
Oh and it doesnt matter what order the WAN or 4G are, I get the same results.

Any ideas?