MultiWan setup route traffic to backup wan loses OPNSense access

[WolfCoffee]

Hello Guys

I'm going crazy trying to set up multi-gateway OPNsense.

Let's say the IP address of 10.0.0.15 is the admin PC

Gateway 1 Default Gateway  8.8.8.8
Gateway 2 Backup Gateway  7.7.7.7

Admin PC needs to use Gateway 2 and not the default gateway

I have added the MAC address in Firewall > Aliases I added Alias as a host-name with Contact of MAC address

Then I added a firewall rule
So when I create a rule in Firewall > Rules > I added action > PASS > Source ADMIN PC > Selected  Gateway 2

We get the IP of Gateway 2 of 7.7.7.7 but we lose access to Opnsense Web GUI

What do I need to add to be able to have second gateway and be able to access Opnsense GUI

[WaffleIron]

Your description is difficult to visualize.  You make it sounds like the admin PC is accessing opnsense across the WAN but it has a 10.x.x.x RFC1918 address.  Can you provide a diagram?