Well.. OTRS is telling you it is looking for a customer key. Which is an attribute that can be used as a unique identifier for a customer user.
Have you consulted the official documentation? [1]http://otrs.github.io/doc/manual/admin/stable/en/html/external-backends.html#ldap-customer-backend --Mathias [1] http://otrs.github.io/doc/manual/admin/stable/en/html/external-backends.html#ldap-customer-backend
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