Adding Tasks to a Queue doesn't seem to work

I have hangFire working fine, I can add jobs and they execute fine however I now have a need for multiple queues which doesn’t seem to work.

My setup is an MVC5 project, in the OWIN startup I perform the following…

public void ConfigureHangfire(IAppBuilder app)
{
    app.UseHangfire(config =>
                      {
                      config.UseSqlServerStorage(Utility.GetConnectionStringFromEfConnectionString());
                      config.UseServer("Billing", "SystemActions");
                      config.UseAuthorizationFilters(new AuthorizationFilter
                          {
                              Roles = "Administrator"
                          });
                      config.UseNinjectActivator(NinjectWebCommon.Kernel);
                       });
}

The method I intend to action as a task is located in my Business Layer and is coded as the following…

[Queue("Billing")]
public void StandardBilling(Int64 companyId)
{
   ...
}

I then call the method from somewhere else in the Business Layer like…

BackgroundJob.Schedule(() => _subscription.StandardBilling(123), TimeSpan.FromDays(1));

The task that is created in Hangfire is put into the Default Queue. No matter what I do (I’ve tried the Enqueue function) it never makes it into the ‘Billing’ queue.