No Audio video when more then 2 people join a conference

Hi there, apologies for posting this issue again but I am really in a dire situation right now. I have spent more than 2 days on fixing this and have followed installation guide and all the related posts carefully but all is in vain. My server details are as follows:
GCP ubuntu-18.04- 10GB.
I have followed and implemented the advanced section of the installation guide too, still there is no result. UDP 10000 is also open and I have forwarded the port too. I tried attaching the log files too , but your portal is not letting me to upload, please help me.This is my first time ever to deploy anything on my own.

You can try this installer if you have an Ubuntu 20.04 or Debian 10 Buster server.