2976923 - Name id attribute ${corporateIdP.<corporateIDP attribute>} must match at least one valid and supported user attribute value

• Identity Authentication (IAS) is acting as a proxy, the authentication happens through a corporate identity provider.
• Subject Name Identifier is set to ${corporateIdP.<corporateIdP attribute>}.
• Identity Federation - Use Identity Authentication user store is enabled.
• Authentication is failing with such user, and the Troubleshooting Log is showing the below error message:

"SAML configuration error. User [null] does not have an attribute [${corporateIdP.<corporateIDP attribute>}] or fallback attribute [xxx] set Caused by: Name id attribute ${corporateIdP.<corporateIDP attribute>} must match at least one valid and supported user attribute value."

Identity Authentication

IAS, corporateIdP, advanced, nameid, Name id attribute, Subject Name Identifier, must match at least one valid and supported user attribute value , KBA , BC-IAM-IDS , Identity Authentication Service , Problem