Configuration issue, sending traffic through Opnsense to VLAN

[popplestones]

I have 2 sites, both running OPNSense. I have wireguard connection between them.

On site A, I have a VLAN12, using the network 10.0.12.0/24

From firewall on Site A, i can ping machines on that vlan, e.g. Ping 10.0.12.2 -> 10.0.12.100

From site B, i can ping the firewall on Site A using 10.0.12.2, however cannot access anything else on the 10.0.12.0/24 network. If i monitor the logs looking for any traffic coming from my machine on site B, I don't see any traffic being blocked. I am unsure what to check next? Hope someone can help :-)

[popplestones]

No responses yet, so i'll add some extra info.

If i use the interface | diagnostics | ping utility, i can successfully ping from source 10.0.12.2 -> 10.0.12.100 however if i use 10.0.22.1 as the source it fails. (This is the wireguard tunnel endpoint address on Site A firewall.)