How To Fix WSS028 - Unexpected SAML subject confirmation type &1

WSS028 - Overview

• Message type: E = Error

• Message class: WSS - Web Services Security

• Message number: 028

• Message text: Unexpected SAML subject confirmation type &1

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WSS028 - Unexpected SAML subject confirmation type &1 ?

  SAP Error Message:
  WSS028 Unexpected SAML subject confirmation type &1
  
  Cause
  This error occurs during SAML (Security Assertion Markup Language) processing in SAP when the system encounters a SAML assertion with a SubjectConfirmation element that has a type not expected or supported by the SAP system.
  In SAML assertions, the <SubjectConfirmation> element specifies how the subject of the assertion is confirmed. Common types include:
  
  urn:oasis:names:tc:SAML:2.0:cm:bearer
  urn:oasis:names:tc:SAML:2.0:cm:holder-of-key
  urn:oasis:names:tc:SAML:2.0:cm:sender-vouches
  
  SAP expects a certain confirmation method (usually bearer) depending on the configuration. If the assertion contains a different or unexpected confirmation method, SAP raises this error.
  
  Typical Scenarios
  
  The Identity Provider (IdP) sends a SAML assertion with a SubjectConfirmation type that SAP does not support or is not configured to accept.
  Misconfiguration in the SAML trust setup between SAP and the IdP.
  Custom or non-standard SAML assertions from the IdP.
  
  
  Solution
  
  
  Check the SAML Assertion:
  
  Use SAML tracing tools (e.g., browser SAML tracer plugins, SAP logs) to capture the SAML assertion.
  Inspect the <SubjectConfirmation> element and note the Method