Umbraco9 & Hangfire with BackOffice User access

Startup.cs

public void ConfigureServices(IServiceCollection services)
{
  ...

#pragma warning disable IDE0022 // Use expression body for methods
  services.AddUmbraco(_env, _config)
      .AddBackOffice()
      .AddComposers()
      .Build();
#pragma warning restore IDE0022 // Use expression body for methods

  services.AddHangfireServer();
  services.AddHangfire(config =>
  {
      config.UseSqlServerStorage(connectionString);
  });

  ...
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
  ...
  
  app.UseUmbraco()
      .WithMiddleware(u =>
      {
          u.UseBackOffice();
      }).WithEndpoints(u =>
      {
          // Hangfire url /umbraco/backoffice/hangfire
          u.EndpointRouteBuilder.MapHangfireDashboardWithAuthorizationPolicy(AuthorizationPolicies.BackOfficeAccess, "/umbraco/backoffice/hangfire");

          u.UseInstallerEndpoints();
          u.UseBackOfficeEndpoints();
      });
      
  ...
}