Cannot open jitsi meet with public ip address

I install jitsi meet from

and I setup domain with ip address 172.xx everything in local network is working fine.

when I setup behind nat.

I cannot access webpage of jitsimeet by but the local network is working fine yet.

I config NAT and forward Public IP 193.xx to 172.xx by Firewall in office.

What I missing config or setup for server please suggest for me. Thank you.