ews使用oauth说“ das格式”。

Question

我正在尝试使用OAuth通过ExchangeWebservice访问我的邮箱。我遵循基于此页的说明：“ https：//learn.microsoft.com/de-de/exchange/client-developer/exchange-web-services/how-to-to-to-to-authenticate-an-ews-an-ews-application-application-application-application-by-by--使用oauth”。

这是我的代码：

        pcaOptions = new PublicClientApplicationOptions()
        {
            TenantId = "<my tenantID>",
            ClientId = "<my ClientID>"
        };

        pca = PublicClientApplicationBuilder.CreateWithApplicationOptions(pcaOptions).Build();

        // The permission scope required for EWS access
        ewsScopes = new string[] { "https://outlook.office365.com/EWS.AccessAsUser.All" };

        service = new ExchangeService();

        // Make the interactive token request
        var authResult = await pca.AcquireTokenInteractive(ewsScopes).ExecuteAsync();

        service.Url = new Uri("https://outlook.office365.com/EWS/Exchange.asmx");
        service.Credentials = new OAuthCredentials(authResult.AccessToken);

到目前为止，Evrything似乎不错。方法“ AcquireTokenInteractive”从Microsoft打开了一个NE窗口，我可以从组织中选择MailAccount。变量“ authresult” IST填充并包含一个新的“ AccessToken”。

问题从这里开始：

var folders = await service.FindFolders(WellKnownFolderName.MsgFolderRoot, new FolderView(10));

此方法导致例外：

Das Format des Werts "Bearer eyJ0eXAiOiJKV1QiLCJub25jZSI6ImRIUXhxTlczdlpDeVM3ZGZrZVZyNlZUQ2xwRU1JWURoMmE5LVgxaEFLMGsiLCJhbGciOiJSUzI1NiIsIng1dCI6ImpTMVhvMU9XRGpfNTJ2YndHTmd2UU8yVnpNYyIsImtpZCI6ImpTMVhvMU9XRGpfNTJ2YndHTmd2UU8yVnpNYyJ9..K6xGoZEMW19JsC-ZSrnUrgF8s8eQv_qwFBZzDELMHnikgZzqDwUEd7_41eAL5hDiKMLTfOfqMrjoVqHViqMic7wyY1QOlx9Kzz6vYTuqMFwYOdevwhEAOgH7uMzCE08c-Wu35UPV_vxWqZfGLLRgJHqTFaUWz0kkdtXk1vLs5MDvWL8CYwXq8gHzM2Mhh8wtB-ZIrjSAHtsrSt43KkBe-cP5PJvqvsyvm4lf-ajKxQtFj0Q4uc8YcCume0suiBgCltxuMcz4uP4OAFgGrbZ04BB33GLDwwFKcR9fs524k2D9kp-0Nf3THDPQYLpraGyPViwfBHdUcDC6BBb40-b0sQ" ist ungültig.

我在做什么错？ 问候，卡尔斯滕。