Rocketchat Youtube sharing - no mic in on-premises version but works with public Jitsi server

I am running an on-premises Jitsi server with Rocketchat. When we share a Youtube video with Rocketchat Youtube sharing we can’t seem to use the computer mic to talk to each other - no problem watching the video. When we use Rocketchat with a public Jitsi server this is not an issue.

Appreciate feedback on what the issue might be.