One or more on-premise AD objects don’t sync to Office 365 (AAD)

Author: Marc Kinzel
While setting up AD FS and enabling Single Sign-On into Office 365 and SharePoint online the following scenario caused some decent pain: After the pretty straightforward installation and successful first synchronization the customer reported that one person is missing within the available active users inside of the o365 portal. Against all expectations we didn’t face any of the obvious and well documented symptoms.
Whether we received an error message stating that:
an attribute has a duplicate value
one or more attributes violate formatting requirements such as character set or character length
neither
the idfix tool (IdFix DirSync Error Remediation Tool) came up with

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Quelle: https://www.techtask.com/one-or-more-on-premise-ad-objects-dont-sync-to-office-365-aad/