How to enable viewing a shared calendar on iPhone
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Go to Settings
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Scroll down to Apps
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Scroll to Calendar and select
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Click on Calendar accounts
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Click on your HPESC email account in Calendar accounts
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There should be a button that allows you to turn on “Calendars”
Go back to your calendar app on your home screen. After you did the above, you should be able to view the the calendar you joined when I sent you the invitation.