Sophos XG HA, vMAC for WAN

Hi!

I have my virtual Sophos XG, working perfectly. I Bought a mini-PC, to install Sophos XG on it and create an HA Pair. Everything is working fine, COOL.

Setup:

Port 1: LAN

Port 2: WAN

Port  3: HA

Note, I have a VLAN for WAN and a VLAN for HA.

So, my issue is that my ISP is using the MAC Address to give the public IP. When the MAC changes, I have to reset the modem. Does the XG use vMAC for WAN, or is there a way to share the same MAc address? or let'S say, Primary have the good MAC, then the Aux will have the Primary when it will become active?

Thanks