Not receiving email notifications from all users

Hi,

I've set up a recurring meeting that people in our company can join for questions. In order for me to know when someone has entered the waiting room, I've enabled email notifications. However, I only SOMETIMES receive the notifications (after about 1 minute):

- from some users I always receive notifications when joining a meeting directly; not always if they are waiting in the waiting room.

- from some users I don't receive any notifications.

I've tried several browsers, with the app, in the webclient, privat sessions, etc. but I can't find out why it works for some users and doesn't for others.

Has anyone had this issue as well? Is there a fix?

Many thanks and best,

Nina