How To Fix WSS023 - No mapping for SAML authentication found (Issuer &3)

SAP Error Message - Details

• Message type: E = Error

• Message class: WSS - Web Services Security

• Message number: 023

• Message text: No mapping for SAML authentication found (Issuer &3)

What causes this issue?

The system received a SAML assertion, but it did not find a usermapping
to authenticate the user.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

The certificate was trusted in the System PSE, but no mapping was
maintained. Maintain the user mapping. Please refer to the SAP
documentation and note 1254821.
SAML Issuer: &V3&
Certificate DN: &V1&&V2&
If you use report RSUSREXTID for maintaing the mapping, the following
information if usefull:
Type of External ID:SA
Prefix of External Name: &V4&
Name of Issuer: &V1&&V2&

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WSS023 - No mapping for SAML authentication found (Issuer &3) ?

  SAP Error Message:
  
  WSS023 No mapping for SAML authentication found (Issuer &3)
  
  Cause
  This error occurs when SAP receives a SAML assertion from an Identity Provider (IdP) with an Issuer value that is not recognized or mapped in the SAP system. Essentially, SAP cannot find a corresponding configuration or trust relationship for the SAML Issuer provided in the authentication request.
  In other words, the SAP system expects a certain Issuer name (entity ID) from the SAML token, but the Issuer in the token does not match any configured SAML Issuer in SAP's SAML 2.0 configuration.
  
  Explanation
  
  SAML Issuer: This is the unique identifier (entity ID) of the Identity Provider (IdP) that issues the SAML assertion.
  SAP needs to have a trust relationship configured for this Issuer to accept and process the SAML assertion.
  If the Issuer is unknown or not configured, SAP cannot authenticate the user and throws this error.
  
  
  Solution
  
  
  Verify the Issuer in the SAML Assertion:
  
  Check the SAML response from the IdP.
  Identify the Issuer (entity ID) value in the SAML assertion.
  
  
  
  Check SAP SAML 2.0 Configuration:
  
  Go to transaction SAML2 in SAP.
  Under Identity Provider (IdP) Configuration, verify if the Issuer from the SAML assertion is configured.
  If not configured, you need to add the IdP metadata or manually create a new IdP configuration with the correct Issuer.
  
  
  
  Import or Update IdP Metadata:
  
  Obtain the IdP metadata XML file from the Identity Provider.
  Import this metadata into SAP via the SAML2 configuration.
  This will create or update the IdP configuration with the correct Issuer.
  
  
  
  Check Trust Relationship:
  
  Ensure that the trust relationship between SAP (Service Provider) and the IdP is properly established.
  Certificates and keys should be correctly imported and valid.
  
  
  
  Adjust Issuer Name if Needed:
  
  Sometimes the IdP might send a different Issuer than expected.
  Coordinate with the IdP administrator to confirm the correct Issuer or adjust SAP configuration accordingly.
  
  
  
  Activate the SAML 2.0 Configuration:
  
  After changes, activate the SAML 2.0 configuration in SAP.
  
  
  
  Test the SAML Authentication:
  
  Retry the SAML login to verify that the error is resolved.
  
  
  
  
  Related Information
  
  SAP Note: Check for any SAP Notes related to SAML 2.0 configuration issues.
  Transaction SAML2: Main transaction for configuring and monitoring SAML 2.0 in SAP.
  SAML 2.0 Configuration Guide: SAP Help Portal documentation on setting up SAML 2.0.
  IdP Metadata: Ensure the metadata is up-to-date and correctly imported.
  Logs: Use transaction SM21 or system logs to get more details on the error.
  SAP Support: If the problem persists, consider raising a support ticket with SAP, providing the SAML assertion and configuration details.
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  SAP does not find a configured mapping for the SAML Issuer (entity ID) received.
  
  
  Solution
  Import or configure the correct IdP metadata in SAP SAML2 configuration matching Issuer.
  
  
  Checkpoints
  Verify Issuer in SAML assertion, import IdP metadata, establish trust, activate config.
  
  
  Tools
  Transaction SAML2, SAP logs, IdP metadata files.
  
  
  
  
  If you need help extracting the Issuer from the SAML assertion or configuring the SAML2 settings in SAP, please let me know!