How To Fix SAML2157 - Unknown user mapping mode: '&1'

SAML2157 - Overview

• Message type: E = Error

• Message class: SAML2 - SAML2 Nachrichten

• Message number: 157

• Message text: Unknown user mapping mode: '&1'

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 SAML2157 - Unknown user mapping mode: '&1' ?

  The SAP error message SAML2157, which states "Unknown user mapping mode: '&1'", typically occurs in the context of Single Sign-On (SSO) configurations using SAML (Security Assertion Markup Language). This error indicates that the system has encountered an unrecognized or invalid user mapping mode specified in the SAML configuration.
  
  Cause:
  The error can be caused by several factors:
  
  Incorrect Configuration: The user mapping mode specified in the SAML configuration is not recognized by the system. This could be due to a typo or an unsupported value.
  Version Mismatch: The SAML configuration might be using a feature or value that is not supported in the current version of the SAP system.
  Missing Parameters: Required parameters for user mapping may not be set, leading to the system being unable to interpret the mapping mode correctly.
  
  
  Solution:
  To resolve the SAML2157 error, you can take the following steps:
  
  
  Check Configuration:
  
  Go to the SAML configuration settings in your SAP system (usually found in