An administrator discovers that a user's on-premises AD account has been synchronized but the user cannot sign in to Microsoft 365. The account shows 'DirSyncEnabled: True' in Azure AD but no license is assigned. What is the most likely cause?
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A
The UPN suffix is not verified in Azure AD
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B
The user's OU is excluded from synchronization
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C
Password hash synchronization is not enabled
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D
The account is in staging mode