Calendar permissions only provide view or edit access to your calendar. Delegate Access provides permission to view your mailbox and can provide send-on-behalf-of capabilities to those you authorize.  Ensure permissions are properly established for both your calendar and mail, follow these directions:

Calendar Permissions:

Calendar permissions provide the ability to establish view or edit access to your calendar.  To review, update or remove calendar permission:

1. Open your Outlook Calendar.  From the Home Menu, select the Share Calendar option, from the dropdown select calendar.

2. The Calendar Properties dialogue box will display, select the Permissions tab.

3. On the Permissions tab, review each Name and their Permission Level. Update, Add or remove as needed. A “Custom” Permission Level indicates the individual is also identified as a delegate.

Delegate Access:

To review and update Delegates and their access to your Outlook account, follow these directions:

1. Open Outlook, select File.  Then select Account Settings, Delegate Access.

2.  The Delegates dialogue box will open.  If you have delegates identified, their names will appear.  If you have no delegates the field will be blank. You can choose to Add or Remove Delegates from this dialogue box.

3.  To Review Delegates Permissions, click on the individual’s name to highlight it, select Permissions, the Delegate Permissions dialogue box will appear. [Additionally, you can Add or Remove Delegates.]

4.  Review and Update permissions as needed.  Select OK

• Calendar Permissions – Share an Outlook calendar with other people – Office Support (microsoft.com)
• Delegate Access – Allow someone else to manage your mail and calendar – Office Support (microsoft.com)

(Disclaimer: Some information covered in linked resources may not always apply or be available in the Government Community Cloud -GCC- environment.)