OSN - Test Punchout Error

Hi,

We are onboarding a supplier punchout via OSN

when supplier clicks on 'Test Punchout' , we are getting the below error.

Can you please advice ?

<?xml version = '1.0' encoding = 'UTF-8'?>

<!DOCTYPE cXML SYSTEM "http://xml.cxml.org/schemas/cXML/1.1.007/cXML.dtd">

<cXML version="1.1.007" xml:lang="en-US" payloadID="20170510111321.12345.-21581@osn.com" timestamp="2017-05-10T11:13:21-06:00">

   <Header>

      <From>

         <Credential domain="DUNS">

            <Identity>404971700</Identity>

         </Credential>

      </From>

      <To>

         <Credential domain="DUNS">

            <Identity>404971700</Identity>

         </Credential>

      </To>

      <Sender>

         <Credential domain="Oracle Exchange Test 6.2.4">

            <Identity>testexchange.oracle.com</Identity>

            <SharedSecret>********</SharedSecret>

         </Credential>

         <UserAgent>Oracle Exchange Test 6.2.4</UserAgent>

      </Sender>

   </Header>

   <Request>

      <PunchOutSetupRequest operation="create">

         <BuyerCookie>12345678</BuyerCookie>