I am reading licensing information of user from VSTS but it is not authenticating itself with Access Token credentials.
string accessToken = "{AccessTokenHere}";
VssOAuthAccessTokenCredential accessTokenCredentials = new VssOAuthAccessTokenCredential(new VssOAuthAccessToken(accessToken));
var credentials = new VssClientCredentials(accessTokenCredentials);
VssConnection connection = new VssConnection(new Uri(this.ServerUri), credentials);
var licensingHttpClient = connection.GetClient<LicensingHttpClient>();
var accountEntitlement = licensingHttpClient.GetAccountEntitlementAsync().Result;
var license = accountEntitlement.License;