For the Automated Scheduling to work, integrating your calendar is a requirement.
Steps:
Click Interview Invites Tab > Integration > Exchange
This page below will be displayed. Enter your details, check the agreement box and click on Link Exchange Account button
Click Link Exchange Account button
Select your account
Allow Cronofy by clicking the Allow button
Click on the dropdown to choose the calendar to integrate
Select calendar
Click on Next button
Click on Close button
Related topic:
Integrating your Google Calendar
Additional keywords:
Outlook, office 365