Since migrating from Exchange 2010 to 2013, we are having a problem with being able to send Sharing Invites from Linked Mailboxes. The users are prevented from sending the Sharing Invitation to an external domain we've got a OrganizationRelationship (via
Microsoft Federation Gateway) established with, getting the "The sharing invitation couldn't be sent to the following recipients: xyz@domain.com . Please try again later." The pop up notification occurs with Outlook and OWA.
It does not occur when sending from a mailbox enabled user within the Exchange resource domain( ie non-linked mailbox).
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