HI,
We were able to solve this by editing the saml_utils.cs file:
Saml2PostBinding p = new Saml2PostBinding();
XmlDocument xmlDoc = p.Bind(req).XmlDocument;
// Added to match time format
xmlDoc.DocumentElement.SetAttribute("IssueInstant", req.IssueInstant.ToString("yyyy-MM- ddTHH:mm:ss.ffZ"));
ssXmlSaml = xmlDoc.OuterXml;
ssValidation.ssSTSAMLValidation.ssSuccess = true;
Regards,
Shah