FluentBookings triggers unwanted iCloud Calendar Invitation email to attendee - how to stop this?

I'm held back this week in launching FluentBooking due to an awkward 2nd email to attendees generated by Apple iCloud Calendar. I do have the FluentBookings Apple Calendar integration set up to monitor appointments in my calendar however I cannot find any way to turn off this insistent email that looks terribly alongside my intentionally crafted confirmation email with all the necessary information in it. Can anyone direct me to a solution to this problem? Thank you, Twig