Unable to access Gitea via VPN

Hi, I am an IT admin and have setup Gitea on a server. It can be accessed in local network, but it is not working via VPN.

Port 3000 is also permitted in the firewall policy.

Logs show that firewall is sending traffic to Gitea server, but not receiving any response back. We also have another application on the same server on a different port which remains accessible via local network and VPN both.

I tried to allow the port in Windows defender as well but it did not have any effect.

What could be the issue here? Any ideas please?