Oauth 2: AcquireByUserNameandPassword не работает или выдает ошибку

Question

Я пытаюсь получить токен, используя Oauth2. Проблема, с которой я сталкиваюсь, состоит в том, что я не получаю результат аутентификации или исключение. он просто попадает в строку AuthenticationResult result = await app.AcquireTokenByUsernamePassword(new[] { "Mail.Send" }, "somebody@test.com", pass) и останавливается. Есть идеи?

    static void Main(string[] args)
    {

        SampleConfiguration config = SampleConfiguration.ReadFromJsonFile("appsettings.json");
        var appConfig = config.PublicClientApplicationOptions;
        var app = PublicClientApplicationBuilder.CreateWithApplicationOptions(appConfig)
                                                .Build();

        SecureString pass = new SecureString();
        string password = "******";

        foreach (char c in password)
        {
            pass.AppendChar(c);
        }

        var test = SendRequest(app, pass);
    }


    private static async Task<bool> SendRequest(IPublicClientApplication app, SecureString pass)
    {

        try
        {
            AuthenticationResult result = await app.AcquireTokenByUsernamePassword(new[] { "Mail.Send" }, "somebody@test.com", pass)
                    .ExecuteAsync();
        }
        catch (Exception ex)
        {
            throw;
        }

        return true;

    }

Json Файл

{
  "Authentication": {
    // Azure Cloud instance among:
    // - AzurePublic (see https://aka.ms/aaddevv2). This is the default value
    // - AzureUsGovernment (see https://docs.microsoft.com/azure/azure-government/documentation-government-developer-guide)
    // - AzureChina (see https://docs.microsoft.com/azure/china/china-get-started-developer-guide)
    // - AzureGermany (See https://docs.microsoft.com/azure/germany/germany-developer-guide)
    "AzureCloudInstance": "AzurePublic",

    // Azure AD Audience among:
    // - AzureAdMyOrg (single tenant: you need to also provide the TenantId
    // - AzureAdMultipleOrgs (multi-tenant): Any work and school accounts
    // - AzureAdAndPersonalMicrosoftAccount (any work and school account or Microsoft personal account)
    // - PersonalMicrosoftAccount (Microsoft personal account only)
    "AadAuthorityAudience": "AzureAdMultipleOrgs",

    // ClientId (ApplicationId) as copied from the application registration (which depends on the cloud instance)
    // See docs referenced in the AzureCloudInstance section above
    "ClientId": "xxx-xxx-xxx-xxxxxxxx"
  },

  // Web API. Here Microsoft Graph. The endpoint is different depending on the cloud instance
  // (See docs referenced in the "AzureCloudInstance" section above.
  "WebAPI": {
    "MicrosoftGraphBaseEndpoint": "https://graph.microsoft.com"
  }