请求获取日历事件响应 404，前提是分配了权限并使用 Microsoft Graph API 获取了 accessToken

我想构建一个具有获取其他人的日历事件功能的网络应用程序。我已经注册了该应用程序https://apps.dev.microsoft.com/并要求Calendars.Read允许。我确信管理员已同意分配这些权限（我让他通过管理员同意页面来完成）。

下面是我的 ASP.Net 控制器代码，旨在测试事件 API。目标API是：

MicrosoftGraphCalendarApi = "https://graph.microsoft.com/v1.0/users/{0}/events";

public async Task<string> GetUserCalendar()
{
    ConfidentialClientApplication cc =
        new ConfidentialClientApplication(Globals.ClientId, Globals.RedirectUri,
            new ClientCredential(Globals.ClientSecret),
            null,
            new TokenCache());

    AuthenticationResult result =
        await cc.AcquireTokenForClientAsync(new string[] { "https://graph.microsoft.com/.default" });

    HttpClient client = new HttpClient();
    string requestUrl = String.Format(Globals.MicrosoftGraphCalendarApi, "[email protected]");

    HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, requestUrl);
    request.Headers.Authorization =
        new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", result.AccessToken);

    HttpResponseMessage response = await client.SendAsync(request);
    response.EnsureSuccessStatusCode();

    string json = await response.Content.ReadAsStringAsync();
    return json;
}

当被调用时，我似乎设法得到了accessToken。然而，要求获得events回应一个404错误。以下是完整的回应：

{
    StatusCode : 404,
    ReasonPhrase: 'Not Found',
    Version : 1.1,
    Content : System.Net.Http.StreamContent,
    Headers:
    { 
      Transfer-Encoding: chunked
      request-id: 34f1f9b3-34c9-444f-9037-5446884e3fb9
      client-request-id: 34f1f9b3-34c9-444f-9037-5446884e3fb9
      x-ms-ags-diagnostic: 
        {
            "ServerInfo":
            {
                "DataCenter": "East Asia",
                "Slice": "SliceA",
                "ScaleUnit": "000",
                "Host": "AGSFE_IN_2",
                "ADSiteName": "HKG"
            }
        }      
      Duration: 1250.6509
      Cache-Control: private
      Date: Fri, 03 Nov 2017 02:53:03 GMT
      Content-Type: application/json
    }
}
System.Net.Http.HttpResponseMessage

我不知道问题出在哪里。请帮忙，谢谢。

终于解决了。用户必须首先“共享”或“发布”目标日历。否则，即使管理员同意，其他帐户也无法访问它。