Microsoft 365 Administrator Expert MS-102 Practice Question
A company uses Microsoft Entra Connect with Password Hash Synchronization (PHS) as the primary sign-in method. One user reports that after entering her credentials she receives the message "Your password has expired" and the sign-in fails. In the Microsoft Entra sign-in logs the attempt is recorded as:
Result: Failure
Failure reason: 50055 - Password expired
Authentication requirement: Password Hash Sync
In Active Directory the user account shows the Password never expires setting, and the account is not locked out. Which action is most likely to resolve the user's authentication issue?
Dismiss the high-risk sign-in in Microsoft Entra ID Protection so the user can sign in without triggering risk-based password change.
Reduce the password length to less than 128 characters and perform a full password synchronization.
Reset the user's password directly in Microsoft Entra ID and require the user to set a new password at next sign-in.
Clear the "User must change password at next logon" flag for the account in Active Directory and initiate an immediate delta synchronization with Entra Connect.
Error code 50055 in the Microsoft Entra sign-in logs indicates that Azure AD considers the password expired. When an on-premises account is marked with the "User must change password at next logon" flag (pwdLastSet = 0) during a Password Hash Synchronization cycle, Azure AD stores the hash but tags it as expired. Clearing the flag in Active Directory and forcing a delta synchronization transmits a usable password hash, after which the user can authenticate successfully. The other options do not address a condition that produces 50055 with PHS:
Conditional Access cannot mark a password as expired.
Identity Protection risk dismissals do not change password status.
Password length limits are enforced locally and would generate a different error before synchronization.
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What does the 'User must change password at next logon' flag in Active Directory mean?
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What is Password Hash Synchronization (PHS) in Microsoft Entra Connect?
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What does error code 50055 in Microsoft Entra signify?
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Microsoft 365 Administrator Expert MS-102
Implement and manage Microsoft Entra identity and access
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