You can use Outlook for Mac to access a calendar that another person has shared with you.
Note: For older versions of Outlook for Mac, calendar sharing does not work with "Limited Details" or "Free/Busy" only access. In older Outlook for Mac versions, a minimum of Reviewer access was required.
The recommended solution is to upgrade to the latest version of Outlook for Mac. If you are on an older version of macOS, you may not be able to upgrade to the latest version of Outlook for Mac. In that case, you can ask the calendar owner to grant Reviewer access, or use Outlook on the Web instead.
For assistance, contact the Service Desk.