Cannot establish IPSEC tunnel using double pfSense inner and outer firewalls on each side

[epicitsupport]

We are trying to setup an IPSEC VPN using double firewalls on both ends. We are able to properly configure using a single pfSense firewall on both ends, but are unable to get the tunnel to "Establish" when trying to pass the IPSEC protocols through a pfSense "edge/outer " router first.

[jimp]

Do you have a diagram of the setup? Is there inbound or outbound NAT involved or only routing? What rules do you have passing the traffic? IKEv1 or IKEv2?

[clinx]

Is this already fixed? I think we are having same issue. How did you fixed it?