@#O233 error as a result of a XML format query

Hello!,

i m trying to create a HTTP Data Advanced sensor with the following settings:

i m using request Method POST:

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <GetSpoolMessageCount xmlns="http://tempuri.org/">
      <AuthUserName>yyyyyyyyyy</AuthUserName>
      <AuthPassword>xxxxxxx</AuthPassword>
    </GetSpoolMessageCount>
  </soap:Body>
</soap:Envelope>

on "Custom Content Type" i m using: text/xml; charset=utf-8

and the result always show me a error with the code "@#O233"

but i m sure the XML format its working because i m using another tool (Postman) and gives a the following string:

true046 (the number goes up or down beacuse its a message queue or spool service from a Mail server)

http soap xml