How To Fix SAML2156 - User with alias '&1' does not exist in client '&2'

SAP Error Message - Details

• Message type: E = Error

• Message class: SAML2 - SAML2 Nachrichten

• Message number: 156

• Message text: User with alias '&1' does not exist in client '&2'

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message SAML2156 - User with alias '&1' does not exist in client '&2' ?

  The SAP error message SAML2156 indicates that a user with a specific alias does not exist in the specified client. This error typically occurs in the context of Single Sign-On (SSO) configurations using SAML (Security Assertion Markup Language).
  Cause:
  
  User Alias Not Defined: The user alias specified in the SAML assertion does not correspond to any user in the SAP system for the given client.
  Client-Specific User: The user might exist in another client but not in the one specified in the error message.
  Incorrect Configuration: There may be a misconfiguration in the SAML setup, such as incorrect mapping of user attributes or incorrect client settings.
  User Not Created: The user may not have been created in the SAP system for the specified client.
  
  Solution:
  
  
  Verify User Existence:
  
  Check if the user with the specified alias exists in the SAP client. You can do this by using transaction code SU01 (User Maintenance) and entering the user alias to see if it is present.
  
  
  
  Check Client:
  
  Ensure that you are checking the correct client. Users are client-specific in SAP, so make sure you are logged into the correct client when searching for the user.
  
  
  
  User Creation:
  
  If the user does not exist, create the user in the specified client using transaction SU01. Make sure to assign the necessary roles and authorizations.
  
  
  
  SAML Configuration:
  
  Review the SAML configuration settings in the SAP system. Ensure that the attribute mappings are correctly set up to match the user alias with the corresponding SAP user.
  Check the Identity Provider (IdP) settings to ensure that the correct user attributes are being sent in the SAML assertion.
  
  
  
  Testing:
  
  After making the necessary changes, test the SSO login again to see if the issue is resolved.
  
  
  
  Related Information:
  
  SAML Assertions: Understand how SAML assertions work and how user attributes are mapped from the Identity Provider to the SAP system.
  SAP Documentation: Refer to SAP Help documentation for detailed information on configuring SAML and troubleshooting SSO issues.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SU01 (User Maintenance), SAML2 (SAML Configuration), and SICF (Internet Communication Framework) for troubleshooting.
  
  By following these steps, you should be able to resolve the SAML2156 error and ensure that the user can successfully authenticate using SSO.