I have helper static method to “automatize” generating SSRS reports

public static WindowsFormsHost CreateSSRSReport(string reportServerUrl, string reportSystemName, string reportPath,
    List<Parameter> parameters, int? idKey = null)
{
    WindowsFormsHost windowsFormsHost = new WindowsFormsHost();
    var reportViewer = new ReportViewer();
    reportViewer.ProcessingMode = ProcessingMode.Remote;
    windowsFormsHost.Child = reportViewer;

    ServerReport serverReport = reportViewer.ServerReport;
    serverReport.ReportServerUrl = new Uri(reportServerUrl);
    serverReport.ReportPath = String.Concat("/", reportSystemName, "/", reportPath);

    if(idKey != null)
    {
        var reportParameterInfos = serverReport.GetParameters();
        var reportParameterInfo = reportParameterInfos.FirstOrDefault(p => Equals(p.Name, "IdKey"));
        if (reportParameterInfo != null)
        {
            parameters.Add(new Parameter("IdKey", idKey));
        }
    }

    parameters = parameters ?? new List<Parameter>();
    serverReport.SetParameters(parameters.Select(p => new ReportParameter(p.Name, p.Value.ToString())));
    reportViewer.RefreshReport();

    return windowsFormsHost;
}

I would like to await that operation as the loading time is a bit long and displaying ProgessBar till everything is done and ready would improve user experience.

private async Task GenerateReport()
{
    SetWorkingStatus(true);
    Report = await Task.Run(() => ReportingHelper.CreateSSRSReport(_pluginConfiguration.ReportServerPath,
        _pluginConfiguration.ReportSystemName, SelectedReportDetails.SourceName, null));
    SetWorkingStatus(false);
}

But that resulted in System.InvalidOperationException: 'The calling thread must be STA, because many UI components require this.'

The main application Main method has [STAThread] attribute specified. My next idea was to use Dispatcher

SetWorkingStatus(true);
await Application.Current.Dispatcher.Invoke(async () =>
{
    Report = await Task.Run(() => ReportingHelper.CreateSSRSReport(_pluginConfiguration.ReportServerPath,
        _pluginConfiguration.ReportSystemName, SelectedReportDetails.SourceName, null));
});
SetWorkingStatus(false);

But I keep getting the mentioned exception.

The Exception is thrown at WindowsFormsHost windowsFormsHost = new WindowsFormsHost(); line in the helper method.