How To Fix SAML2022 - The assertion issuer is not identical to the response issuer

SAP Error Message - Details

• Message type: E = Error

• Message class: SAML2 - SAML2 Nachrichten

• Message number: 022

• Message text: The assertion issuer is not identical to the response issuer

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SAML2022 - The assertion issuer is not identical to the response issuer ?

  The SAP error message SAML2022 indicates that there is a mismatch between the issuer of the SAML assertion and the issuer of the SAML response. This error typically occurs in Single Sign-On (SSO) scenarios where SAML (Security Assertion Markup Language) is used for authentication.
  Cause:
  The error occurs when:
  
  The SAML assertion (which contains the authentication information) is issued by a different entity than the SAML response (which is sent back to the service provider).
  The configuration of the Identity Provider (IdP) and Service Provider (SP) is incorrect, leading to mismatched issuer values.
  There may be multiple IdPs configured, and the wrong one is being used for the authentication request.
  
  Solution:
  To resolve the SAML2022 error, you can take the following steps:
  
  
  Check Configuration:
  
  Verify the configuration settings in both the Identity Provider (IdP) and Service Provider (SP).
  Ensure that the issuer values in the SAML assertion and SAML response are identical. This typically involves checking the metadata files or configuration settings in both systems.
  
  
  
  Update Metadata:
  
  If you have recently changed the IdP or SP configurations, ensure that the metadata is updated and correctly reflects the issuer information.
  Make sure that the IdP's metadata is correctly imported into the SP and vice versa.
  
  
  
  Review SAML Assertion:
  
  Use a SAML tracing tool (like SAML-tracer for browsers) to inspect the SAML assertion and response. Look for the <Issuer> element in both the assertion and the response to confirm they match.
  
  
  
  Check for Multiple IdPs:
  
  If your environment has multiple IdPs, ensure that the correct IdP is being used for the authentication request. This may involve checking the routing or configuration settings in your application.
  
  
  
  Consult Documentation:
  
  Refer to the documentation for both the IdP and SP for specific configuration guidelines related to SAML assertions and responses.
  
  
  
  Logs and Debugging:
  
  Check the logs on both the IdP and SP for any additional error messages or warnings that could provide more context about the issue.
  
  
  
  Related Information:
  
  SAML Assertion: A SAML assertion is a package of information that supplies statements about a subject (user) and is used for authentication and authorization.
  Identity Provider (IdP): The entity that authenticates users and issues SAML assertions.
  Service Provider (SP): The entity that consumes SAML assertions to provide access to resources or services.
  SAML Metadata: XML documents that describe the configuration of IdPs and SPs, including issuer information, endpoints, and certificates.
  
  By following these steps, you should be able to identify and resolve the cause of the SAML2022 error in your SAP environment.