There are few possible solutions:

  1. Go to Calendar Integration.
  2. Make sure the Check calendar(s) for availability option is checked.
  3. Make sure that at least one of the calendars is selected under Check calendar(s) for availability.

You have to also make sure if the meetings scheduled using Harmonizely are added to the proper calendar.

  1. Go to Calendar Integration.
  2. Make sure Add new meetings to calendar is enabled and the calendar where the newly scheduled meetings should be added is selected.
  3. Make sure that the calendar selected in Add new meetings to calendar is also selected in Check calendar(s) for availability.

Make sure your existing events in your online calendar have status set to "busy".

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