如何使用MSAL連接到Onedrive？

我試圖連接使用MSAL令牌OneDrive但它返回錯誤=「INVALID_TOKEN」，ERROR_DESCRIPTION =「驗證錯誤」如何使用MSAL連接到Onedrive？

這是我的代碼：

public static string[] Scopes = { "User.Read", "Files.Read", "Sites.Read.All" }; 
    AuthenticationResult ar = await App.ClientApplication.AcquireTokenSilentAsync(Scopes); 
    WelcomeText.Text = $"Welcome {ar.User.Name}"; //Login OK here 

     //get data from API 
     HttpClient client = new HttpClient(); 
     HttpRequestMessage message = new HttpRequestMessage(HttpMethod.Get, "https://api.onedrive.com/v1.0/drives"); 
     message.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", ar.Token); 
     HttpResponseMessage response = await client.SendAsync(message); 
     string responseString = await response.Content.ReadAsStringAsync();

任何人都知道我是什麼做錯了？

來源

2016-07-26 transis