In order for candidate.fyi to access the calendars you have access to in Outlook Calendar, you need to currently be subscribed to it.

The calendars you are subscribed to will appear on the left side in Outlook Calendar like below:

If you don't see a calendar that should be there, click the "Add Calendar" button. From there select "Add from directory", select your personal account to search from, and search for the calendar.

Once you've successfully subscribed (and you see it now populated in your list of calendars), go back into candidate.fyi and refresh the calendar list!
​