订阅Microsoft Graph推送通知时的状态代码429

我正在尝试订阅Microsoft推送通知,每次尝试调用订阅端点时,我都会收到状态代码(429个请求过多)。根据文件:

https://developer.microsoft.com/en-us/graph/docs/concepts/errors

有关请求的信息:

https://graph.microsoft.com/v1.0/subscriptions 

请求负载:

{
"resource": "me/calendars/{calendarId}/events",
"notificationUrl": "https://{myApp}/office365/notifications/",
"changeType": "created,updated,deleted",
"expirationDateTime": "2017-07-22T08:23:42Z"
} 

{
"error": {
    "code": "ExtensionError",
    "message": "Operation: Create; Exception: [Status Code: 429; Reason:  ]",
    "innerError": {
        "request-id": "1ed7e537-8524-4a8b-89eb-43501066e7fa",
        "date": "2017-07-19T09:55:27"
    }
}
}

这里有什么问题?由于我之前在同一资源上多次尝试订阅,它是否会出现此错误?