Outlook - Unable to share calendar - Policy does not allow

Step-by-Step

When attempting to share one of your secondary calendars you may receive the following message: "Policy does not allow granting permissions at this level to one or more of the recipients. Please select another permission level and send the sharing invite again". Follow the steps below to correct this.

1. Select the calendar you want to share. Make certain the the text of the name in the calendar tab is bold.
2. From the ribbon in the Home tab in the Share group, click Share Calendar.
3. Click To (Office 2013) or Add (Office 2016).
4. In the Address book list, click Global Address List.
5. In the Search box type the last name of the person with whom you want to share your calendar.
6. Click Go.
7. Click to highlight the person's name.
8. Click To.
9. Click OK.
10. Repeat steps 5 - 9 for each additional person you want to share your calendar with.
11. If desired,  click Recipient can add, edit and delete items in this calendar.
12. Click Send.

Note: You can also log into o365.dartmouth.edu and click Calendar and share and select the person you would like to share your calendar with or remove people that have access to your calendar and no longer needed.

Cause

This occurs when cached information in the autocomplete list is out of date. You will need to assign individuals to your sharing invitation using the Global Address List dialog box.