AXL soap to add FAC gets "unknown error"

Problem:

The problem is happened when I call AXL SOAP to craete Force Authorization Code, it always return "unknown error". here is the AXL format that I send:

<?xml version="1.0"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <soap:Header/>
  <soap:Body>
    <addFacInfo sequence="?">
      <facInfo>
        <name>Computer Login - Full Name</name>
        <code>123456</code>
        <authorizationLevel>40</authorizationLevel>
      </facInfo>
    </addFacInfo>
  </soap:Body>
</soap:Envelope>

Solution:

Typically, a AXL request would include header that at least contains

Authorization: Basic Q0NNQWRtaW5pc3RyYXRvcjpjaXNjb19jaXNjbw==

SOAPAction: "CUCM:DB ver=9.1"

Making sure the soapaction version matches the wsdl version in the soap envelope.

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns="http://www.cisco.com/AXL/API/9.1">

Since you are in CUCM 9.1, I believe you can use from 7.0 up to 9.1