No audio no video between more than 2 participants with jitsi-meet installed on VPS ( virtual private server)

i follow the quick install to install jitsi server on a VPS . It works perfectly between 2 participants but when the third participant join the room no audio no video (black screen)

Note: i have installed jitsi-meet server on my local machine and it works perfectly when i add this configuration to /etc/jitsi/videobridge/

so is there any additional configuration to do with jitsi-meet installed on VPS

Port forwarding and firewall is the common mistakes after setting public/private addresses.

all required port are forwarding (TCP/443, TCP/4443/ UDP/10000) and still the same problem