I created this two rules port forwarding to access two computers on my local network for remote users and the controller allow me to port forward into the two WAN interfaces, WAN and WAN/LAN1

Port forward in WAN interface is working excellent, but when WAN goes down, it does not work through WAN/LAN1 interface using that specific interface public ip address and trying to access the port is unavailable and close when I run a port scan from the internet.

Please advise what should I do in order to use this port forward with the two WANs, when one Wan fails then with the other, thanks a lot for your support.