Multicast Traffic over IPsec VPN

[GaaTY]

Hello!

My situation:

I have an IPsec VPN Tunnel established with another Fortigate. Inside this tunnel I have configured a GRE Tunnel to received multicast packets through the IPsec Tunnel.

The IPsec Tunnel is Up as well both the Phase 2 Selectors for the IPsec Tunnel & GRE Tunnel. I am able to reach the remote IPsec Tunnel Gateway & and the remote GRE Tunnel Gateway.

Multicast is configured on my end, and I was able to do a static join from my 60F to the Multicast Source.I run a diagnose sniffer packet <GRE> and I can see the packets from the GRE tunnel reaching my firewall.

My problem is, I cannot for the life of me get the packets to reach my internal interface.

I have policies setup to allow traffic from the GRE Tunnel to my Internal interface and reversed (of which I have tried a stupid amount of variations I could think of that made sense). I still can't get the traffic to my internal interface.

Please help.