Need help, Public Ip reachable but nothing behind

Basically,

We got one site that is on vpn IPSEC. the tunnel is UP. from my firewall (fortigateA) I cant ping the public IP of the site(FortigateB). But im not able to ping the actual local IP of the firewall(FortigateB) or anything behind. but everything behind the remote firewall(FortigateB) is able to ping the main firewall(Fortigate A).

From a route perspective on the remote fortigate (FortigateB) in static routes you have one 0.0.0.0 0.0.0.0 WAN1 to go outside and one rule for the inside 10.XX.0.0/16 Internals.

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Sorry if I might not be very clear let me know if you have any questions