Session packages are not compatible with the following configuration settings and vice versa:
Limitation on the number of bookings per day or per week. Session packages cannot work with any limitation on the number of bookings per day or week defined in the Time slot settings of the Booking page. This is due to the fact that the limitation on the number of bookings per day or week is taking into account booked appointments and any limitations on the manner in which Session packages can be made must be done during the time selection process, before the bookings are submitted.
Rule-based assignment Master pages. Session packages cannot be used with Master pages with Rule-based assignment. This is because with Rule-based assignment, bookings are distributed to team members via Round robin, Pooled availability, Pooled availability with priority, or Find member by time. If Session packages were enabled, the bookings might be split across multiple team members. For this reason it is not allowed.