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 Please try again later.


The behavior is by design in Exchange Server 2013.


To work around this issue, use one of the following methods: