Access data in XML file using MSXML2.DOMDocument

I have a document formatted like this:

<TestResult xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<TestName>1234</TestName>
<TestID>P1</TestID>
<Score>70</Score>
<Learner>
<ID>5846</ID>
<Name>Fred Smith</Name>
</Learner>
</TestResult>



I'm loading it as follows:

    Set objXMLHttp = CreateObject("MSXML2.ServerXMLHTTP.6.0")
    objXMLHttp.Open "GET", strURL, False
    objXMLHttp.send
   
' This works but strReturn is formatted using { and : characters not as xml/soap
    strReturn = objXMLHttp.responseText
   
    Set xmlDoc = CreateObject("MSXML2.DOMDocument")
    xmlDoc.async = False
    xmlDoc.LoadXML strReturn

xmldoc as a Parse error, invalid at top level of document

How do I access the score and learner id ?