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Accept a shared calendar invitation on iCloud.com
You can accept a calendar invitation using Calendar on iCloud.com on a tablet or computer.
Go to icloud.com/calendar, then sign in to your Apple Account (if necessary).
Click
at the top of the sidebar.
In the calendar notification, click Join Calendar.
The shared private calendars you join appear in Calendar on iCloud.com and on any device where you’ve signed in to your Apple Account and turned on iCloud for Calendar. See Set up iCloud for Calendar on all your devices.