Did room.meetingId disappear?

I’m using lib-jitsi-meet on a custom install. I had been using room.meetingId to successfully log unique conversation IDs to our server, but after an update of the jitsi stack yesterday that now seems to no longer be an available parameter…?
Is there a function to get a unique ID for each conversation-session (ie. not per-user, but per-session, so user1, 2 and 3 in a conversation will all have the same sessionID)?
Thanks
David