Redundant VPN to Azure using BGP

Hi all,
I'm trying to configure a reduntant VPN to azure using multiple ISP to the same azure VPN Gateway IP, according to this Microsoft document (https://docs.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-bgp-overview#multitunnel) this is possible using BGP. I have configure BPG according to this Watchguard doc (https://www.watchguard.com/help/docs/help-center/en-US/Content/en-US/Fireware/bovpn/manual/bovpn_vif_dynamic_routing_azure.html#AddVIF) but this documentation only instruct to make the VPN using only one gateway and one public Ip.
I have already configured a VPN to Azure using the previus documentation and using 1 of our public IP, I'm trying to configure a second VPN to the same Azure Gateway using another of our public IPs, but when I try to configure BGP for the second BOVPN, when I insert the Azure BGP Peer IP, I receive the error "The peer IP duplicate with another IP at BPVPN virtual interface.."

Do I need to add another BGP Peer IP to the Azure VPN Gateway? Have someone here configured this king of redundant VPN to azure?

Thanks and best regards,
Amedina

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