Can't use HangFire Dashboard in dotnetcore

So I’m using dotnetcore 1.1 and it appears that after making my Configure method in Startup.cs asynchronous, I can’t view the dashboard. Is there something I’m doing incorrectly?

I am using the following code under .net core 1.1, without issues. Maybe it helps you.

        public void ConfigureServices(IServiceCollection services)
        {
            //alle dingen bekijken
            foreach (var item in _settings.AsEnumerable())
            {
                Console.WriteLine($"{item.Key} ---- {item.Value}");
            }

            var redisHostname = _settings["ConnectionSettings:Redis:RedisHostName"];
            var redisPort = _settings["ConnectionSettings:Redis:RedisPort"];
            var hangfirePrefix = _settings["ConnectionSettings:Redis:HangfirePrefix"];
            var ipAddress = Dns.GetHostAddressesAsync(redisHostname).Result.First(i => !i.ToString().StartsWith(":"));
                        
            services.AddHangfire(x =>
            {
                x.UseRedisStorage($"{ipAddress}:{redisPort}", new RedisStorageOptions
                {
                    Prefix = hangfirePrefix,
                    InvisibilityTimeout = TimeSpan.FromHours(12)
                });
            });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            app.UseHangfireDashboard("", new DashboardOptions
            {
                Authorization = Enumerable.Empty<Hangfire.Dashboard.IDashboardAuthorizationFilter>()
            });
        }