Create request to IdP manually
First of all you need to create an instance of TElSAMLAuthnRequestElement. At least TElSAMLAuthnRequestElement.ID, TElSAMLAuthnRequestElement.IssueInstant and TElSAMLAuthnRequestElement.Issuer properties must be filled. TElSAMLAuthnRequestElement.ID should be assigned to a random string value, TElSAMLAuthnRequestElement.IssueInstant is a time of request creation, TElSAMLAuthnRequestElement.Issuer property can be assigned to an instance of TElSAMLIssuerElement representing the issuer of the request. Request may contain TElSAMLAuthnRequestElement.NameIDPolicy property and may be signed.