Share the page, not the meeting
Here is the distinction that saves hosts a lot of awkward replies. The link you advertise is the registration page; the link that opens the session stays private. The page shows what the session is, when it starts with its time zone beside it, and a form to fill. The meeting address โ the Zoom, Meet, Teams or YouTube URL you pasted into your dashboard โ never sits on the page for the whole internet to copy.
So when a colleague asks whether they should forward the join link to their team, the answer is simple: forward the registration page instead. Everyone who belongs will register, take their own access link from the confirmation email, and appear on your list. Everyone who does not register simply has no way in, which is exactly what you wanted when you capped the room.