Take into account the configured rules for different user groups!
Is it been configured that the user in question can only make a reservering one week in advance? Then you cannot make a repeat reservation outside this period. Have you configured that only 2 reservations per week can be made? Then you cannot make more than 2 recurring reservations.
If a reservation has already been made at a certain time, this recurring reservation cannot be made for that moment. The other reservations in the row of recurring reservations will be made. You will receive an email confirmation with an overview of all reservations, including those that were unsuccessful.
Canceling an entire series in one go is not yet possible at the moment. So don’t book too far in advance, because you can only cancel the reservations individually.