Routing between two IPSEC VPN hub and spokes

Hi,

I have a hub and spoke VPN (IP SEC)with around 60 clients connected. Fortigate is the hub, and multi vendor routers are used as spokes. All the spokes are in different subnets and they can communicate. There are two policies, one allowing from VPN to LAN and from LAN to VPN. That is working fine. The problem appears when I created another VPN hub and spoke (with appropriate policies). Now the spokes from the new VPN cant ping spokes from the old VPN and vice versa. Tried creating two additional policies to allow old VPN interface to the new VPN interface and vice versa, but it didn't work.

Any thoughts on this? 

Is some routing needed?

All subnets are different for both VPNs so I dont think it's a NAT issue. All policies were created with NAT disabled.