Outlook事件API:至少有一个属性验证失败错误

我通过提供以下JSON输入,通过Outlook API创建Outlook事件:

{  
   "subject":"bla bla bla",
   "start":{  
      "dateTime":"2018-01-14T17:00:00",
      "timeZone":"India Standard Time"
   },
    "Attendees": [
    {
      "EmailAddress": {
        "Address": "janets@a830edad9050849NDA1.onmicrosoft.com",
        "Name": "Janet Schorr"
      },
      "Type": "Required"
    }
  ]
}

但是,我得到以下错误响应:

{
    "error": {
        "code": "ErrorPropertyValidationFailure",
        "message": "At least one property failed validation.",
        "innerError": {
            "request-id": "6f3d1676-77cc-49b0-87a2-b96b6ed1f15d",
            "date": "2018-01-12T05:25:10"
        }
    }
}

如果我通过 end属性 在上面的JSON中,成功创建了事件。以下JSON工作正常:

{  
   "subject":"bla bla bla",
   "start":{  
      "dateTime":"2018-01-14T17:00:00",
      "timeZone":"India Standard Time"
   },
   "end":{  
          "dateTime":"2018-01-14T17:00:00",
          "timeZone":"India Standard Time"
       },
    "Attendees": [
    {
      "EmailAddress": {
        "Address": "janets@a830edad9050849NDA1.onmicrosoft.com",
        "Name": "Janet Schorr"
      },
      "Type": "Required"
    }
  ]
}

是否需要通过 end属性 用于创建事件?或者上述JSON输入是否有问题?