Select the 'Let Windows apps access the calendar' to user_is_in_control This policy setting specifies whether Windows apps can access the calendar. If you choose the "User is in control" option, employees in your organization can decide whether Windows apps can access the calendar by using Settings > Privacy on the device. If you choose the "Force Allow" option, Windows apps are allowed to access the calendar and employees in your organization cannot change it. If you choose the "Force Deny" option, Windows apps are not allowed to access the calendar and employees in your organization cannot change it. If you disable or do not configure this policy setting, employees in your organization can decide whether Windows apps can access the calendar by using Settings > Privacy on the device. If an app is open when this Group Policy object is applied on a device, employees must restart the app or device for the policy changes to be applied to the app. Counter Measure: Enable and configure this setting to "Force Deny" depending on your organization's requirements. Potential Impact: Windows apps are not allowed to access the calendar and employees in your organization cannot change it.

[user is in control/force allow/force deny]

(1) GPO: Computer ConfigurationAdministrative TemplatesWindows ComponentsApp PrivacyLet Windows apps access the calendar (2) REG: HKEY_LOCAL_MACHINESoftwarePoliciesMicrosoftWindowsAppPrivacyLetAppsAccessCalendar