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401订阅使用Exchange服务和OAuth的推送通知时未经授权

[英]401 Unauthorized while subscribing to push notifications with Exchange service and OAuth

我正在尝试使用oauth访问EWS托管API(订阅推送通知),如下所示:

var authenticationTask = await authenticationContext.AcquireTokenAsync("https://outlook.office365.com", new ClientCredential(clientID, clientSecret));
string targetSmtp = "user123@mydomain.onmicrosoft.com";
ExchangeService exchangeService = new ExchangeService(ExchangeVersion.Exchange2013);
exchangeService.Url = someURL;
exchangeService.TraceEnabled = true;
exchangeService.TraceFlags = TraceFlags.All;
exchangeService.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.PrincipalName, "user123@mydomain.onmicrosoft.com");
exchangeService.HttpHeaders.Add("X-AnchorMailbox", targetSmtp);
exchangeService.Credentials = new OAuthCredentials(authenticationTask.AccessToken);
PushSubscription subscription = exchangeService.SubscribeToPushNotifications(
                                            new[] { someFolder },
                                            new Uri(postBackUrl),
                                            15,
                                            null,
                                            EventType.NewMail,
                                            EventType.Created,
                                            EventType.Deleted,
                                            EventType.Modified,
                                            EventType.Moved,
                                            EventType.Copied);

我能够获取我的应用程序的令牌,但在订阅用户(user123@mydomain.onmicrosoft.com)进行推送通知时,我收到"The request failed. The remote server returned an error: (401) Unauthorized." 错误

更新:尝试按照此处提到的完全相同的步骤: Azure AD应用程序访问令牌进行交换模拟,但仍然获得401。

阿希什

对于那些在同一问题上苦苦挣扎的人,我们需要使用证书(而不是使用客户端密钥)来获取已注册应用程序的访问令牌。 有关如何操作的更多详细信息,请参阅: https//blogs.msdn.microsoft.com/exchangedev/2015/01/21/building-daemon-or-service-apps-with-office-365-mail-calendar -and-接触的API-的oauth2-客户凭证流/

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