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To answer your question, it is not possible to add Restricted Administrative Units directly to a user in Microsoft Entra ID. Instead, you can add users to RAUs. This design ensures that administrative tasks are delegated securely and efficiently, allowing for better management and protection of specific objects within your tenant.
Reference: https://video2.skills-academy.com/en-us/entra/identity/role-based-access-control/admin-units-members-add
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Akhilesh.
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