Jitsi-met not working in self hosted server

i have hosted my jitsi-meet in a google cloud platform with public ip address as my hostname.

when i type the ipaddress and /something i can able to start a conference call and if i invite a friend using link he is joining i can see he is joined but neither i can hear his audio nor his video but we can see our faces but not the other persons

sometimes it is working for some people or sometimes not and if two people are talking with eachother if a third person joins it is going blank

please help me with this issue

i have deployed using the quickinstall.md in your guthub repo and did the advance part in that