You would like to change the Name ID Format requested by XSA in the SAML authentication request.
SAP HANA Extended Application Services, Advanced model
NameIDPolicy emailAddress saml xs advanced xsuaa uaa Requested nameId-format: urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress is not configured as supported for trusted Service Provider , KBA , BC-XS-SEC , UAA and Security for HANA XSA engine , How To
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