You've integrated Google or Outlook Calendar and added availability to the OnboardIQ calendar. Great! You can expect to see sessions in your Google or Outlook Calendar as soon as applicants book the sessions. In other words, you won't see ALL of your availability in your calendar; only the booked sessions; it's set up this way so that your Google or Outlook Calendar isn't overcrowded and you only see confirmed events.
If you do have booked sessions, but they're not appearing in your Google Calendar, you might want to try unlinking and relinking your GCal.