office.js，office.context.mailbox.item.cc.getAsync不起作用

Question

我正在努力使用Office-JS创建Outlook加载项。

我需要获取CC和电子邮件。

由于我阅读了这些页面，所以我编写了此代码。但是，当cc.getAsync和to.getAsync毫无用处时，getAsync返回收集消息的身体。 https://learn.microsoft.com/ja-jp/javascript/api/requirement-sets/requirement-sets/requirement-setlook/requirement-set-set-set-1.5/office.context.context.mailbox.mailbox.itembox.item？ JS-Preview https://learn.microsoft.com/en-us/javascript/api/opi/oflook/office.recipients?view=Outlook-js-1.5&ppreserve-view = True

// It does not work though I expect to appear cc of the message on taskpane of my add-in
 const item = Office.context.mailbox.item;
 item.cc.getAsync(function (asyncResult) {
      if (asyncResult.status === Office.AsyncResultStatus.Succeeded) {
        document.getElementById("message").innerHTML = `<h2 class="message">${asyncResult.value}</h2>`;
        document.getElementById("message").style.visibility = "visible";
      }
    });

// same here
const item = Office.context.mailbox.item;
item.to.getAsync(function (asyncResult) {
      if (asyncResult.status === Office.AsyncResultStatus.Succeeded) {
        document.getElementById("message").innerHTML = `<h2 class="message">${asyncResult.value}</h2>`;
        document.getElementById("message").style.visibility = "visible";
      }
    });

// on the other hand, I can see the body of  the message on my taskpane
item.body.getAsync(Office.CoercionType.Html, function callback(result) {
    if (result.status === Office.AsyncResultStatus.Succeeded) {
      document.getElementById("message").innerHTML = `<h2 class="message">${result.value}</h2>`;
      document.getElementById("message").style.visibility = "visible";
    }
  });