Today, with Teams Webinar you can not easily identified webinar registered participants from others in the lobby.
Good news as now you can automatically let registered users to bypass the webinar lobby.
After creating the webinar in Teams, access the meeting options
From there you can turn on the options:
- “Attendees with a registration link can bypass the lobby” to allow registered participants to bypass the lobby
- “Reject anyone who can’t bypass the lobby” to automatically reject participants trying to join the webinar while not registered – this also works in conjunction with the “Who can bypass the lobby?” option.