Proper ExpandDL Soap

rightsoap.xml

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Header>
    <t:RequestServerVersion Version="Exchange2013_SP1" />
  </soap:Header>
  <soap:Body>
    <m:ExpandDL>
      <m:Mailbox>
       <t:EmailAddress>test</t:EmailAddress>
      </m:Mailbox>
    </m:ExpandDL>
  </soap:Body>
</soap:Envelope>