How to add certificates to HttpWebRequest request to a https webserver

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VB

certificate

Am trying to send 4 certificates while making a web service call using the but keep getting the error The request was aborted: Could not create SSL/TLS secure channel.

Dim req As HttpWebRequest = HttpWebRequest.CreateDefault(New System.Uri(cred.endpoint))
Dim root As X509Certificate2 = New X509Certificate2()
Dim policy As X509Certificate2 = New X509Certificate2()
Dim issue As X509Certificate2 = New X509Certificate2()
Dim certv As X509Certificate2 = New X509Certificate2()

Dim rootStore As New X509Store(StoreName.Root, StoreLocation.LocalMachine)
rootStore.Open(OpenFlags.ReadOnly)
root = rootStore.Certificates.Find(X509FindType.FindByIssuerName, "ROOT-CA", True)(0)
Dim intmStore As New X509Store(StoreName.CertificateAuthority, StoreLocation.LocalMachine)
intmStore.Open(OpenFlags.ReadOnly)
policy = intmStore.Certificates.Find(X509FindType.FindByIssuerName, "ROOT-CA", True)(0)
issue = intmStore.Certificates.Find(X509FindType.FindByIssuerName, "POLICY-CA", True)(0)
certv = intmStore.Certificates.Find(X509FindType.FindByIssuerName, "ISSUECA05-CA", True)(0)
req.ClientCertificates.Add(root)
req.ClientCertificates.Add(policy)
req.ClientCertificates.Add(issue)
req.ClientCertificates.Add(certv)
req.Headers.Add("SOAP:Action")
req.ContentType = "text/xml; charset=utf-8"
req.Accept = "text/xml"
req.Method = "POST"
ServicePointManager.Expect100Continue = True
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls
ServicePointManager.ServerCertificateValidationCallback = AddressOf AcceptAllCertifications
Dim soapXML As New System.Xml.XmlDocument
soapXML.LoadXml(txn)
Dim strm As Stream = req.GetRequestStream()
soapXML.Save(strm)

Dim resp = req.GetResponse()
Dim stread As StreamReader = New StreamReader(resp.GetResponseStream())
Dim st As String = stread.ReadToEnd()

When I check the trace logs from wireshark i notice that the certificate length is 0. Does that mean am not sending the certificate?