I've followed webinar set up from this link https://support.microsoft.com/en-us/office/schedule-a-webinar-0719a9bd-07a0-47fd-8415-6c576860f36a
and set requirement registration for everyone,
my question is,
1. why guest/anonymous attendees can join room.
2. How can I set up webinar that only registered attendees can join?
3. How can I block attendees share invite link?

