Just to confirm it's now up and running - required the setting of a static route on the Cisco Meraki that pointed all traffic on 192.168.3.0/24 subnet to the FDM IP.

I've set this up to try and forward the server sitting at 192.168.3.2 on the inside interface to 192.168.2.2 on the outside interface: NAT:   ACP Trying to ping the server using 192.168.2.2 but no result

There's just a Cisco Meraki sitting at Office A, and no FTD. The Cisco Meraki Cloud is set up with an Auto VPN with Office B on 192.168.2.0/24 network, so this may be causing it. Is it possible to forward the Server sitting on the inside of Office B ...

To confirm - it goes Office A 192.168.1.0/24 --> Cisco Meraki --Auto VPN Tunnel -- Cisco Meraki --> Office B Outside 192.168.2.0/24 --> FPR1120 --> Office B Inside 192.168.3.0/24

Office B, there's just a Cisco Meraki at Office A (no FPR Firewall)