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Error - AADSTS75011 Authentication method by which the user authenticated with the service doesn't match requested authentication method AuthnContextClassRef

  • Článek

This article describes a problem in which you receive the error message, "Error - AADSTS75011 Authentication method by which the user authenticated with the service doesn't match requested authentication method AuthnContextClassRef," when you try to sign in to a SAML-based single sign-on (SSO) configured app that has been integrated with Microsoft Entra ID.

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Symptoms

You receive a AADSTS75011 error message when you try to sign in to an application that has been set up to use Microsoft Entra ID for identity management by using SAML-based SSO.

Cause

The RequestedAuthnContext is in the SAML request. This means the app is expecting the AuthnContext specified by the AuthnContextClassRef. However, the user has already authenticated prior to access the application and the AuthnContext (authentication method) used for that previous authentication is different from the one being requested. For example, a federated user access to MyApps and WIA occurred. The AuthnContextClassRef will be urn:federation:authentication:windows. Microsoft Entra ID won't perform a fresh authentication request, it will use the authentication context that was passed-through it by the IdP (ADFS or any other federation service in this case). Therefore, there will be a mismatch if the app requests other than urn:federation:authentication:windows. Another scenario is when MultiFactor was used: 'X509, MultiFactor.

Resolution

RequestedAuthnContext is an optional value. If possible, ask the application if the value could be removed.

Another option is to make sure that the RequestedAuthnContext value will be honored. This is done by requesting a fresh authentication. By doing this, when the SAML request is processed, a fresh authentication is done and AuthnContext is honored. In order to request a Fresh Authentication, the SAML request must contain the value, forceAuthn="true".

More information

For a full list of Active Directory Authentication and authorization error codes, see Microsoft Entra authentication and authorization error codes

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