Large scale private meetings

Hello,

I'm frustrated- I'm looking for a solution that will allow me to create a meeting that only a pre-defined list of people can attend.

I have a pro account.

I tried pre-registration, but this doesn't block people that got my meeting's link from trying to enter it. I can block those only manually at the waiting room.

Maybe I'm missing something out.

Please advise

Thank you very much

Amir