Thank you all. It was the two issues mentioned here e.g. typo of organizationUnit and
On Tuesday, February 23, 2016 7:49 PM, Quanah Gibson-Mount <quanah(a)zimbra.com>
--On Wednesday, February 24, 2016 12:50 AM +0100 Emmanuel Lécharny
No to mention there is a missing dc Attribute in the entry.
Good point. It's unlikely the author meant to combine the two objectClasses.
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