未知错误“参数：sourceEntity，值：为空”。试图创造转变时

Question

当我尝试使用GraphAPI 创建班次时，出现未知错误：

Argument: sourceEntity, Value:  is null.

这是内部错误还是我的？我该怎么办？

Headers:  
Authorization - Token

Content-Type - application/json

POST "https://graph.microsoft.com/beta/teams/15e4bf1d-5330-464a-b9e4-897772825d75/schedule/shifts"

我发送的此JSON。-

{
  "id": "SHFT_9f95964d-eb55-4ca9-8026-95e30fcfbb50",
  "userId": "86f82613-12f2-4717-a162-9ac6727b1518",
  "schedulingGroupId": "TAG_0661866e-3772-4512-b292-24c2b5ec4ddd",
  "sharedShift": {
    "displayName": "Дневная смена",
    "notes": "Комментарий",
    "startDateTime": "2019-07-11T11:00:00Z",
    "endDateTime": "2019-07-14T21:00:00Z",
    "theme": "blue",
    "activities": [
      {
        "isPaid": true,
        "startDateTime": "2019-07-11T11:00:00Z",
        "endDateTime": "2019-07-14T21:00:00Z",
        "code": "",
        "displayName": "Ланч"
      }
    ]
  },
  "draftShift": {
    "displayName": "Day shift",
    "notes": "Please do inventory as part of your shift.",
    "startDateTime": "2019-03-11T15:00:00Z",
    "endDateTime": "2019-03-12T00:00:00Z",
    "theme": "blue",
    "activities": [
      {
        "isPaid": true,
        "startDateTime": "2019-03-11T15:00:00Z",
        "endDateTime": "2019-03-11T15:30:00Z",
        "code": "",
        "displayName": "Lunch"
      }
    ]
  }
}

我收到此错误-

{
  "error": {
    "code": "UnknownError",
    "message": "Argument: sourceEntity, Value:  is null.",
    "innerError": {
      "request-id": "21945d1d-cb53-4e39-9915-a0840919602c",
      "date": "2019-07-09T06:12:10"
    }
  }
}