Hello,
Thank you for reaching out!
Could you clarify, what is zone "TRB" assigned to? It does not seem to provide any function here. By default, the firewall has only two zones - lan and wan. RMS VPN will create a third one, and most of the settings can be controlled via the RMS itself.
To enable LAN forwarding, log into RMS, navigate to RMS VPN → VPN HUBS → Open your created hub → Routes tab → On the TRB device in question, there should be a LAN toggle. Enable it. This will automatically create a rule so that all of the LAN devices can be reached.
If the firewall settings were changed a lot, this function might not function properly, so I'd recommend updating to the latest firmware version and updating without the "Keep settings" option enabled.
Let me know if there are any further questions!
Best regards,
DaumantasG