Audio does not work for certain conferences

I have set up a server on DigitalOcean to host video meetings. Followed the basic youtube tutorial here (https://www.youtube.com/watch?v=IQRwtUamHQU&t=692s).
In every 2 or 3 calls, I am seeing audio issues where one party is able to hear while the other one is not. I have looked at jvb.log and jicofo.log files - but nothing seems off to me. Meetings are held on the JITSI MEET App.

How can I debug this issue? Should I share the log files?

Any help here will be very appreciated. I am still not sure how to debug this issue.