Hi @Vogel, Kim
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I understand that you have a on-premises AD attribute name called Description and you want to display that attribute for each user in Entra ID user properties.
Entra ID does not have a Description attribute for users, you cannot add this attribute under user attributes, but you can map this attribute to any other attribute by using the synchronization rule editor with this you can customize the synchronization rule to map the attribute.
For more information, please read How to customize a synchronization rule Microsoft Entra Connect Sync: Directory extensions
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Thanks,
Akhilesh.
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