如何通過Microsoft Graph API在計劃中添加任務

我想知道如何使用Microsoft Graph API在Planner計劃中創建任務。現在我試圖在使用「Create task」API的計劃器計劃中完成任務，但是我得到了UnknownError。如何通過Microsoft Graph API在計劃中添加任務

{ 
    "error": { 
     "code": "UnknownError", 
     "message": "", 
     "innerError": { 
      "request-id": "2303b87d-fb0c-431c-9336-c93908758d25", 
      "date": "2016-06-28T10:16:56" 
     } 
    } 
}

正如文檔中所描述的那樣，我發佈到api這樣。

POST https://graph.microsoft.com/beta/tasks 
Content-type: application/json 
Content-length: 192 
{ 
    "assignedTo": "<I set my uuid>", 
    "planId": "<I set planId which I created>", 
    "bucketId": "<I set bucketId which is included the plan>", 
    "title": "test4", 
    "orderHint": "A" 
}

任何想法，我哪裏會出錯？如果您知道如何在Planner計劃中添加任務，請分享這個想法？

來源

2016-06-28 Masayuki