PepVPN can use only one WAN interface at a time. so it will not show (as i have see in my work) you the individual state per WAN interface. You will only have the state of the VPN globally.
Yes, at the moment the PepVPN traffic can not reach WAN2. You need to open the ports on the router you have attached to WAN2 so that PepVPN traffic can get in. Forward 32015 and 4500 to the WAN2 IP (192.168.100.100) on that other router.