You're configuring SAML2.0, and you saw the option to use ManageName ID (MNI), but your Identity Provider doesn't support MNI.
SAP Netweaver Application Server Java
MNI, SAML2.0, logon, ManageName ID, IDP, SP , KBA , BC-JAS-SEC-SML , JAVA SAML 1.1 and 2.0 , Problem
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