When trying to log in using single sign-on (SSO), I am getting the following error:

Authentication Error - Failed to validate the user. Please contact your administrator for further assistance.

The error log shows Failed to get Name id. Stack: ariba.util.saml.SAMLException: org.opensaml.xml.validation.ValidationException: Signature did not validate against the credential's key

The certificate sent in the SAML request is different than what is specified in your Site Profile.

Contact SAP Ariba customer support to update the certificate in the your Site Profile with the certificate being sent from your side in the Security Assertion Markup Language (SAML) request.

If the error log includes Failed to get Name id. Stack: ariba.util.saml.SAMLException: condition is not valid instead of the above Signature did not validate against the credential's key, see this article.

If you are instead getting the error Authentication Error - Authentication Failed, see Invalid SAML.

Anwendungsservices für Beschaffung > Application Framework > Single Sign-On