Firewall Policies not working as expected

I have removed two physical interfaces (internal2 and internal3) from the internal interface. I gave internal2 192.168.10.1/24 and internal3 192.168.20.1/24. I connected a device to port 2 and gave it the IP address 192.168.10.10/24. I plugged another device into internal3 and gave it 192.168.20.10. I made sure each device could ping it's own gateway .1 address. I then tried to ping the opposite IP gateway which as expected did not work. I then created a firewall policy called 10 to 20, Inc int: internal2, Out int: internal3, source: all, destination: all, service: all. Action: accept. Apart from disabling NAT and setting the logging to All Sessions (which doesn't seem to be logging anything by the way, but that's a separate issue) everything else was left as default. Yet I can't seem to ping one device from another. I can't even ping the opposite gateway. What am I doing wrong?