C＃Microsoft Graph身份验证问题 - 无法建立调用应用程序的标识

Question

我在尝试使用Microsoft Graph API时遇到以下异常，我不确定我做错了什么：

“无法建立调用应用程序的身份。”

通过令牌的初始身份验证似乎没有错误

public class AzureAuthenticationProvider : IAuthenticationProvider
{
    public async Task AuthenticateRequestAsync(HttpRequestMessage request)
    {
        string clientId = "xxxxx";
        string clientSecret = "yyyyyy";

        string tenant = config.AzureUat.UserName.Split('@')[1]; 

        AuthenticationContext authContext = new AuthenticationContext("https://login.windows.net/" + tenant + "/oauth2/token");

        ClientCredential creds = new ClientCredential(clientId, clientSecret);

        AuthenticationResult authResult = await authContext.AcquireTokenAsync("https://graph.microsoft.com/", creds);

        request.Headers.Add("Authorization", "Bearer " + authResult.AccessToken);
    }
}

然后我加载GraphServiceClient，这似乎也可以正常工作

GraphServiceClient graphClient = new GraphServiceClient(new AzureAuthenticationProvider());

这是代码获取身份验证失败的地方：

var groups = await graphClient.Groups.Request().GetAsync();

任何帮助都将非常感谢!!!