Hi @Will Smith ,
Did you create a group calendar and add other people's calendars to it? You can refer to the steps in the article:
Create, view, or delete a calendar group
In addition, if you want to view the detailed information of other people's calendars, he needs to grant you the permission to view the detailed information of the calendar.
Share your Microsoft 365 or Outlook.com calendar with people inside or outside your organization
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