Although the mailbox has been moved to the target Exchange server, a problem occurred when adding the following user or group ...

Although the mailbox has been moved to the target Exchange server, a problem occurred when adding the following user or group to msExchMailboxSecurityDescriptor: '%s'. 'sdpermUserGenericRead', 'fsdpermUserMailboxOwner' and 'fsdpermUserPrimaryUser'. Permissions might have been lost.