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

SAML2154 - Overview

• 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

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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.

Unfortunately, there isn't any extra information in this error notice.

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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