{Operation returned an invalid status code 'Forbidden} while executing ExportToFileInGroupAsync

[saadashraf]

I am trying to export a power BI report in my custom application.

I added a button, and on that button click, i am executing this code.

var url = XXX;
var content = new Dictionary<string, string>();
content["grant_type"] = "XXX";
content["resource"] = "XXX";
content["username"] = XXX;
content["password"] = XXX;
content["client_id"] = XXX;

var response = await APIHelper.MakeAsyncRequest(url, content);
var tokenresult = response.Content.ReadAsStringAsync().Result;
var OAuthResultModel = JsonConvert.DeserializeObject<OAuthResultModel>(tokenresult);
var authenticationResult = OAuthResultModel;

var credentials = new TokenCredentials(authenticationResult.AccessToken, "Bearer");
var client = new PowerBIClient(credentials);
var reportsResult = await client.Reports.ExportToFileInGroupAsync(GroupID, ReportID, exportRequest);

when code execute the last line , the error occured.