To get free/busy information from users calendars (https://docs.microsoft.com/en-us/graph/api/calendar-getschedule?view=graph-rest-1.0&tabs=http), the API permissions Calendars.Read or Calendars.Read...
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Microsoft
MicrosoftI'm looking for exactly the same thing. More in line with what jhilderbrando mentioned above so that I can give a 3rd party application access to free/busy time and not all the potential private info in every calendar item.