当前经过身份验证的上下文对于ASP.NET for Graph API中的此请求无效

Question

正如问题所言，我已经创建了一个简单的asp.net mvc项目，其中有邮递员进行练习。我从official website开始学习了所有教程。我想做的程序是修改邮箱设置。

这是我尝试的代码

        private const string clientId = "*******";
        private const string clientKey = "********";
        private const string tenant = "********";
        private const string instance = "https://login.microsoftonline.com/";
        private const string developer = "*******";

        [HttpPatch]
        public async Task<IHttpActionResult> TEST()
        {
            IConfidentialClientApplication confidentialClientApplication = ConfidentialClientApplicationBuilder
                .Create(clientId)
                .WithTenantId(tenant)
                .WithClientSecret(clientKey)
                .Build();

            ClientCredentialProvider authProvider = new ClientCredentialProvider(confidentialClientApplication);
            GraphServiceClient graphClient = new GraphServiceClient(authProvider);

            var mailboxSettings = new MailboxSettings
            {
                AdditionalData = new Dictionary<string, object>()
                {
                    {"@odata.context","https://graph.microsoft.com/beta/" + developer + "/mailboxSettings"}
                },
                AutomaticRepliesSetting = new AutomaticRepliesSetting
                {
                    Status = AutomaticRepliesStatus.Scheduled,
                    ScheduledStartDateTime = new DateTimeTimeZone
                    {
                        DateTime = "2016-03-20T18:00:00",
                        TimeZone = "UTC"
                    },
                    ScheduledEndDateTime = new DateTimeTimeZone
                    {
                        DateTime = "2016-03-28T18:00:00",
                        TimeZone = "UTC"
                    }
                }
            };

            var me = new User();
            me.MailboxSettings = mailboxSettings;

            await graphClient.Me
                .Request()
                .UpdateAsync(me);

            if (me.MailboxSettings != null)
            {
                return Ok(new ApiResponseBase<List<OooRulesResponse>>()
                {
                    Data = null,
                    Message = "Success",
                    Status = ApiResponseBaseStatus.Success
                });
            }
            else
            {
                return Ok(new ApiResponseBase<List<OooRulesResponse>>()
                {
                    Data = null,
                    Message = "Failed to insert scheduler.",
                    Status = ApiResponseBaseStatus.Success
                });

            }
        }

邮递员告诉我这个错误

Message: Current authenticated context is not valid for this request. This occurs when a request is made
to an endpoint that requires user sign-in. For example, /me requires a signed-in user.  Acquire a token
on behalf of a user to make requests to these endpoints.  Use the OAuth 2.0 authorization code flow for
mobile and native apps and the OAuth 2.0 implicit flow for single-page web apps.

是的，我知道可以选择一些身份验证提供程序来获取令牌，因此我使用Daemon应用程序和客户端凭据提供程序来构建它。在编写代码之前，我还设置了一个环境，该环境设置为MailboxSettings.ReadWrite等在没有用户的情况下获得访问权限。

但是此错误表明我正在使用另一种方法，该方法代表用户获取访问权限。我该如何解决这个错误？