Power BI : System.InvalidOperationException: Showing a modal dialog box or form when the application

[varund29]

We are facing following error when deployed project in IIS, And it is working fine when ran from visual studio.

Error at when calling below method to get AccessToken

return authContext.AcquireToken(this.PowerBiAPI, this.ClientID, new Uri(this.RedirectUrl)).AccessToken;

Error is :

System.InvalidOperationException: Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation. Specify the ServiceNotification or DefaultDesktopOnly style to display a notification from a service application. at Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext.RunAsyncTask[T](Task`1 task) at DSLUI.Controllers.BusinessLogic.ReportService.GetAccessToken()

Here this.ClientID is generated for App Type: Native

web : https://dev.powerbi.com/apps

If anyone have any idea regarding above error, please help us.

[varund29 · Accepted solution]

As i am using App type Native,AAD popup comming at server side causing this issue.

Then i changes it to App Type to Web app, and getting access token using below code, Issue got resolved.

public async Task<string> GetAccessToken()
    {
        try
        {
            var password = Utility.Decrypt(this.PWBI_Psw);

            var content = new FormUrlEncodedContent(new[]
                 {
                 new KeyValuePair<string, string>("grant_type", "password"),
                 new KeyValuePair<string, string>("scope", "openid"),
                 new KeyValuePair<string, string>("username", this.PWBI_User),
                 new KeyValuePair<string, string>("password", password),
                 new KeyValuePair<string, string>("client_id", this.ClientID),
                 new KeyValuePair<string, string>("client_secret", this.ClientSecretKey),
                 new KeyValuePair<string, string>("resource", this.PowerBiAPI)
                 });

            string tokenEndpointUri = string.Format(this.TokenEndpointUri, this.TenantID);
            using (var client = new HttpClient())
            {
                HttpResponseMessage res = client.PostAsync(tokenEndpointUri, content).Result;

                string json = await res.Content.ReadAsStringAsync();

                var obj = JObject.Parse(json);
                var AccessToken = (string)obj["access_token"];

                return AccessToken;
            }
        }
        catch (Exception ex)
        {

            throw ex;
        }
    }

[v-haibl-msft]

@varund29

Please take a look at this thread to see if it helps.

Best Regards,
Herbert