EWS在线会议

Question

全部。我需要交流方面的帮助。我想使用EWS创建在线会议。首先，我创建了一个S4B会议，然后尝试在Outlook中创建在线会议。但是我有以下错误：

<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<h:ServerVersionInfo MajorVersion="15" MinorVersion="20" MajorBuildNumber="1017" MinorBuildNumber="22" Version="V2018_01_08" xmlns:h="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
</s:Header>

<s:Body>
  <m:UpdateItemResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
    <m:ResponseMessages>
      <m:UpdateItemResponseMessage ResponseClass="Error">
        <m:MessageText>Set action is invalid for property.</m:MessageText>
        <m:ResponseCode>ErrorInvalidPropertySet</m:ResponseCode>
        <m:DescriptiveLinkKey>0</m:DescriptiveLinkKey>
        <m:MessageXml><t:FieldURI FieldURI="calendar:IsOnlineMeeting"/></m:MessageXml>
        <m:Items/>
      </m:UpdateItemResponseMessage>
    </m:ResponseMessages>
  </m:UpdateItemResponse>
</s:Body>
</s:Envelope>

正如文档所说：isOnlineMeeting属性仅对于组织者的会议是可读写的，但是我是组织者。