Error in Outlook Web App when Exchange Server 2013 users try to grant Delegate permissions to a security group: Sharing invitation couldn't be sent
Original KB number: 3188800
An Exchange Server 2013 user tries to grant Delegate permissions through Calendar sharing to a security group by using Outlook Web App. However, the user receives the following error message:
The sharing invitation couldn't be sent to the following recipients:Groupalias@contoso.com. Please try again later.
The behavior is by design in Exchange Server 2013.
To work around this issue, use one of the following methods:
- Use an Outlook client to grant delegate permissions to the security group. For more information, see Allow someone else to manage your mail and calendar.
- Install Exchange Server 2016.