How To Fix SAML2154 - Can't map user name. Assertion attribute with name '&1' was not found

SAP Error Message - Details

• Message type: E = Error

• Message class: SAML2 - SAML2 Nachrichten

• Message number: 154

• Message text: Can't map user name. Assertion attribute with name '&1' was not found

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SAML2154 - Can't map user name. Assertion attribute with name '&1' was not found ?

  The SAP error message SAML2154 indicates that there is an issue with the mapping of user attributes in a SAML (Security Assertion Markup Language) authentication process. Specifically, the error states that an assertion attribute with a specified name (represented by &1) was not found in the SAML assertion received from the Identity Provider (IdP).
  Cause:
  The error typically arises due to one of the following reasons:
  
  
  Missing Attribute in SAML Assertion: The SAML assertion sent by the IdP does not contain the expected attribute that is required for user mapping in SAP. This could be due to misconfiguration on the IdP side.
  
  
  Incorrect Attribute Mapping Configuration: The SAP system may be configured to look for an attribute that does not exist in the SAML assertion. This could be due to a mismatch in attribute names or incorrect configuration in the SAP system.
  
  
  IdP Configuration Issues: The Identity Provider may not be configured to send the required attributes. This could be due to policy settings or user attribute settings in the IdP.
  
  
  Solution:
  To resolve the SAML2154 error, you can follow these steps:
  
  
  Check SAML Assertion: Use a SAML tracing tool or browser developer tools to inspect the SAML assertion being sent from the IdP. Look for the attribute that corresponds to the name indicated in the error message (&1). Ensure that it is present in the assertion.
  
  
  Verify Attribute Mapping in SAP:
  
  Go to the SAP system configuration for SAML authentication.
  Check the attribute mapping settings to ensure that the attribute name you are expecting matches the name in the SAML assertion.
  If necessary, update the mapping to match the actual attribute name being sent by the IdP.
  
  
  
  Update IdP Configuration:
  
  If the required attribute is missing from the SAML assertion, you may need to update the IdP configuration to include this attribute.
  Ensure that the IdP is configured to send the necessary user attributes (e.g., username, email, etc.) in the SAML assertion.
  
  
  
  Test the Configuration: After making the necessary changes, perform a test login to verify that the issue has been resolved and that the user can be successfully authenticated.
  
  
  Related Information:
  
  SAML Assertions: Understand the structure of SAML assertions and how attributes are defined within them. This can help in troubleshooting issues related to attribute mapping.
  SAP Documentation: Refer to SAP's official documentation on SAML authentication and user mapping for detailed guidance on configuration.
  IdP Documentation: Consult the documentation for your specific Identity Provider (e.g., ADFS, Okta, Azure AD) for information on how to configure user attributes in SAML assertions.
  
  By following these steps, you should be able to identify and resolve the cause of the SAML2154 error in your SAP system.