When people are invited to an already scheduled meeting as a follow-up, the people who have already been invited do not get a notice. Example:
There was a meeting invitation for a specific group of people. As a follow-up, the CEO was also invited. Nobody knew that he was invited as well, because they did not get a hint.
The notification works when the subject is changed. Only for invited persons not. It would be great if the notification wouls also work for Persons.