Microsoft Bookings now supports online meetings and group services

Clyver1225 

It sounds like you want multiple separate appointments available for one time slot. You can achieve this by adding more staff to the calendar service. Think of one appointment as equaling one staff member. They are booking with staff member availability not “time slots”. If you think of it that way it’ll make more sense.  So if you want patients to be able to book 4 different Appointments of the same time slot then you’ll need 4 staff members with availability in that time slot because patients need to be paired with a staff member. 

This blog post is talking about opening up a staff member to meeting more than one patient at a time by grouping the patients into one time slot for that staff member. Since that’s not the outcome you want then I advise you add more staff members and don’t turn on the multiple attendees. 

Hope that helps.