When you lock your meeting, this puts new attendees who join in a Waiting Room.
Attendees will see this when attempting to join a locked meeting:
The Meeting Host will receive a notification and all those waiting will be listed in the left attendee list where the Host may accept or decline the request:
Open your attendee list to see more:
The Host can send a message to attendees using the icon shown above:
If the Host declines the requests, the Host will see the following:
Note: if the Host checks the box highlighted, attendees will not be able to try to re-enter your meeting.
Once accepted, the attendee will join the meeting.
If declined, the attendee will see this message: