Why is add-on time not being added to the appointment when I book an appointment in the Online Calendar or Business App?

Why is Add-On time not being accounted for in appointment timeslots?

When you are booking an appointment for the customer and you add an add-on, you must book the appointment by "Availability", not by "Override".

Override mode is manual, and does not add in the add-on time for you automatically.

Availability mode follows all of your availability rules and will add in the add-on time for you automatically!