OptionalMessageThe meeting message/conversation message id (Graph messageId), when present. '0' for most meetings.
OptionalOrganizerThe organizer's Azure AD object id, when the join URL encodes it (Graph organizer.identity.user.id).
OptionalTenantThe Azure tenant id, when the join URL encodes it (Graph tid).
The meeting thread id (the chat/conversation id behind the join URL, e.g. 19:meeting_…@thread.v2).
The Graph create-call meeting-coordinate fields parsed out of a Teams join URL.