The Outlook calendar helps to keep track of important dates, appointments, and events. In addition, it also has a sharing function. Sometimes, the sharing function might not work on Outlook. A few of the reasons for this Outlook shared calendar permissions not working problem are given here:
Here are the steps to resolve the Outlook shared calendar permissions not working problem on Outlook.
Launch the Microsoft Outlook client.
Navigate to the File tab and choose Account Settings.
Double-click your email account and click the Advanced tab.