Locate the Settings icon
and go to Email & SMS notifications under Communications.
Select the "Appointment Reminder" email template and on top of the pop-up window, under "When to send" you'll find a checkbox to attach a calendar invitation.
If you want to include it, keep the box checked, if you don't want to include it, uncheck it.
Make sure you save changes before closing the pop-up window.
Keywords:
delete calendar invitation, edit appointment reminder, calendar invite, include calendar invitation