创建事件返回ErrorPropertyValidationFailure

Question

我正在尝试通过提供以下JSON输入来通过Microsoft Graph创建事件：

{
  "subject": "Test event",
  "organizer": {
    "emailAddress": {
      "name": "Name 1",
      "address": "name1@graffter.onmicrosoft.com"
    }
  },
  "start": {
    "dateTime": "2018-10-18T01:45:38",
    "timeZone": "UTC"
  },
  "end": {
    "dateTime": "2018-10-18T04:45:38",
    "timeZone": "UTC"
  },
  "attendees": [
    {
      "emailAddress": {
        "name": "Name 2",
        "address": "name2@graffter.onmicrosoft.com"
      },
      "type": "required"
    },
    {
      "emailAddress": {
        "name": "room",
        "address": "room@graffter.onmicrosoft.com"
      },
      "type": "resource"
    }
  ],
  "body": {
    "content": "Prueba de evento",
    "contentType": "HTML"
  },
  "location": {
    "displayName": "room",
    "locationEmailAddress": "room@graffter.onmicrosoft.com"
  }
}

但是，有时我会收到以下错误响应（有时是我的意思）：

{
  "error": {
    "code": "ErrorPropertyValidationFailure",
    "message": "At least one property failed validation.",
    "innerError": {
      "request-id": "9f528d43-ed74-4c02-a29c-f01e47f24717",
      "date": "2018-10-18T12:14:31"
    }
  }
}

问题是，使用相同的代码和相同的JSON请求（当然，更改日期），有时它可以工作，而有时却失败。

我正在关注official documentation，拥有所需的所有权限，并且我正在使用的access_token与其他API调用（例如/messages）完美配合。