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Microsoft Entra sign-in blocked due to account lock or malicious IP

AADSTS50053

Microsoft Entra blocked the sign-in because the account is locked after repeated bad attempts or because the sign-in was blocked due to risky or malicious IP activity.

AADSTS50053authentication

Observed message

AADSTS50053

Why it happens

  • The user account was locked after repeated failed sign-in attempts.
  • Sign-in was blocked because it originated from an IP associated with malicious activity.
  • Conditional access or risk evaluation prevented the authentication flow.

How to fix it

  1. Review the failed sign-in in Microsoft Entra sign-in logs to confirm the failure reason.
  2. Unblock or remediate the user account if it is locked.
  3. Retry only after the underlying risk or lockout condition has been addressed.

Official reference

Microsoft Learn: Microsoft Entra authentication and authorization error codes

Related errors

AADSTS700016Microsoft Entra application identifier was not foundAADSTS70001Microsoft Entra application is disabledAADSTS70003Microsoft Entra application used an unsupported grant typeAADSTS70007Microsoft Entra application used an unsupported response mode

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AADSTS50053: account locked or sign-in blocked in Entra | Error Atlas