从ExchangeWebService基本身份验证迁移到OAuth2.0

Question

我的目标是迁移我们的Exchange连接以使用OAuth2.0，因此我们将在2020年删除基本身份验证。

我使用基本身份验证的当前代码是：

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013_SP1);
service.Credentials = new WebCredentials(MailBox, Password, "domamer");
try

    service.AutodiscoverUrl(MailBox, RedirectionUrlValidationCallback);

catch

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

在此处查看Microsoft提供的文档：（link）我对以下代码进行了编码，期望它将取代上面的代码。

var pcaOptions = new PublicClientApplicationOptions

    ClientId = AppSettings.GetOauthClientID(),
    TenantId = AppSettings.GetOauthTenantID()
;

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

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

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

// Configure the ExchangeService with the access token
var ewsClient = new ExchangeService();
ewsClient.Url = new Uri("https://outlook.office365.com/EWS/Exchange.asmx");
ewsClient.Credentials = new OAuthCredentials(authResult.AccessToken);
ewsClient.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, MailBox);

我以为新代码中的“ ewsClient”等同于原始代码中的“ service”。

当我尝试单步执行项目时，它仅在此行结束：

var authResult = await pca.AcquireTokenInteractive(ewsScopes).ExecuteAsync();

我已经仔细检查了我的ClientID，TenantID是否正确。

以前有人遇到过这个问题吗？可能的解决方案或要检查的东西？

我尝试使用Try / Catch希望得到一条错误消息，但是我从来没有碰到我在所有Console.WriteLine上设置的断点。它只是锁定并停止在ExecuteAsync（）行响应

try

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

    // Configure the ExchangeService with the access token
    var ewsClient = new ExchangeService();
    ewsClient.Url = new Uri("https://outlook.office365.com/EWS/Exchange.asmx");
    ewsClient.Credentials = new OAuthCredentials(authResult.AccessToken);
    ewsClient.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, EmailBox);

    Console.WriteLine("Made it Here");

catch (MsalException ex)

    Console.WriteLine($"Error acquiring access token: ex.ToString()");

catch (Exception ex)

    Console.WriteLine($"Error: ex.ToString()");