3778123 - IAS to Entra proxy SSO goes into missing attributes error

• When configuring single sign-on with SAP Cloud Identity Services - Identity Authentication Service (IAS) and proxy to Microsoft Entra, sign-in fails for users.
• Error message: "The Identity Provider (IDP) configuration is incomplete. Missing required attributes: email, firstname, lastname. Please contact your workspace administrator to configure the IDP with the required user attributes and ensure the required properties are set for your user."
• SSO appeared to work only when using IAS, goes into an error once a proxy to Entra is established.

• Product: SAP LeanIX solutions
• SAP LeanIX MTM Single Sign-on

leanix sso, ias, identity authentication, idp configuration incomplete, missing attributes, email, firstname, lastname, saml mapping, azure ad, entra id, proxy idp, append application id to issuer, identity directory, user store, attribute mapping , KBA , LIX-MTM-SSO , SAP LeanIX MTM Single Sign-on , Problem