I want to setup SAML authentication using simpleSAMLphp.
Any OnApp with SAML (3.3 and higher)
Unfortunately, at this time we only Support ADFS, so simpleSAMLphp isn't Supported.
As a workaround you can try to configure claim rule (or it's equivalent in simpleSAMLphp) by your self, that sends the user's email as name_id in response to IdP SSO Target URL.
Again, this is unsupported, and only offered as a possible workaround.