使用Graph API从Azure AD检索所有用户时禁止403

Question

尝试让所有用户使用Graph API时，我从Azure AD获得403 Forbidden响应：

    public static async Task<string> AppAuthenticationAsync()
    {
        var tenant = ConfigurationManager.AppSettings["ida:TenantId"];
        var resource = "https://graph.microsoft.com/";
        var clientID = ConfigurationManager.AppSettings["ida:ClientId"];
        var secret = ConfigurationManager.AppSettings["ida:AppKey"];

        var authority = $"https://login.microsoftonline.com/{tenant}";
        var authContext = new Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext(authority);
        var credentials = new ClientCredential(clientID, secret);
        var authResult = await authContext.AcquireTokenAsync(resource, credentials);

        return authResult.AccessToken;
    }

    public static async Task<string[]> GetUsersListAsync(HttpClient client)
    {
        var payload = await client.GetStringAsync($"https://graph.microsoft.com/v1.0/users");

        var obj = JsonConvert.DeserializeObject<JObject>(payload);
        var users = from g in obj["value"]
                               select g["displayName"].Value<string>();

        return users.ToArray();
    }

以下是代码，在我的控制器中使用以获得结果

   var token = await AppAuthenticationAsync();
   using (var client = new HttpClient())
   {
       client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
       var users = await GetUsersListAsync(client);
       lstADUsers = users.ToList();
   }

在Azure AD中注册的客户端具有以下所有权限：

我错过了什么吗？

Answer 1

您已授予委派权限，但使用客户端凭据调用API。

为API提供应用程序应用程序权限，您就可以调用它。 委派权限仅在您代表用户拨打电话时适用。