When I try to sign in to my SAP Ariba application using Single Sign-On (SSO), I receive the following error message:

Authentication error: User does not exist.

SAP Ariba Sourcing

SAP Ariba Procurement

Sign in to the SAP Ariba application using your designated Single Sign-On (SSO) method.

There are two possible causes for this error:

• The User ID being sent from your company’s sign-in system does not match an existing User ID in the SAP Ariba application. User IDs are case-sensitive.
• Your organization’s security certificate used for SSO is not correctly configured with the current SAP Ariba server certificate.

This issue typically requires assistance from your internal IT support team or SAP Ariba administrator. You should contact them and provide the following potential solutions:

1. Confirm that the User ID being passed from your company’s Identity Provider (IdP) exactly matches the User ID created in the SAP Ariba application. User IDs must be an identical, case-sensitive match.
2. Verify that your company’s SSO configuration is using the latest SAP Ariba server certificate, as detailed in recent SAP Ariba update notifications.

Procurement Application Services > Application Framework > Single Sign-On
Procurement Application Services > Intelligent Configuration Manager (ICM)
Purchasing
Strategic Sourcing > Strategic Sourcing - Performance