How to allow multiple appointments to be created in the same time slot, for the same user

We need to overbook with Microsoft Bookings and a few months ago it was possible to create several appointments in the same time slot of the same user via the Bookings API.

In the past weeks we have noticed the behavior has changed: when we create two appointments in the same time slot for the same user but the second request returns the error "Staff not available" and it does not create the second appointment.

The API we are using is:

POST /solutions/bookingBusinesses/{id}/appointments

(https://learn.microsoft.com/en-us/graph/api/bookingbusiness-post-appointments?view=graph-rest-1.0&tabs=http)

Is there a way to allow overbooking to create overlapping appointments for the same user?