Hi @will.zoom after some more digging on forums, it seems my issue has been flagged in this post where @tommy said it would be addressed in JIRA: ZOOM-126518, but I don’t see any posts saying a solution has been implemented.
I can match emails using the User API for now like it was suggested in the post, but I don’t always have the email the user uses for Zoom when I’m registering them in our system. This can lead to some discrepancies and it would be great if I could somehow match info from the List Registrants Endpoint to the participant joined webhook.