I am unable to get past the login page in my identityserver4 ui

Question

I am using IdentityServer4 with my .NET Core project, have added the IdentityServer4 UI dependencies using iex ((New-Object System.Net.WebClient).DownloadString('https://raw.githubusercontent.com/IdentityServer/IdentityServer4.Quickstart.UI/release/get.ps1')) in my command line.

And this added the UI defaults successfully, however when login in from the UI, i am only redirected back to the login page of IdentityServer4 . I noticed some CSP filter attributes have been added by default ([SecurityHeaders]).

When i remove this attribute from my Grants controller, I am getting through to the Grants page as I imagined, now I know this is there to protect against Cross Site Scripting and Sniffing.

My question is how do I have this SecurityHeadersAttribute in there as still get redirected to the Grants controller successfully for a successful login.

Test Data Used

public static class ApiRecourses
{
    public static IEnumerable<ApiResource> Get()
    {
        return new ApiResource[]
        {
            new ApiResource("testresource", "testresourcedisplayname")
        };
    }
}

public static class Clients
{
    public static IEnumerable<Client> Get()
    {
        return new Client[]
        {
            new Client
            {
                ClientId = "testclient",
                ClientName = "testclientname",
                ClientSecrets = new Secret[]
                {
                    new Secret("secret".Sha256())
                },
                AllowedScopes = new List<string>() {"testresource"},
                AllowedGrantTypes = GrantTypes.ResourceOwnerPasswordAndClientCredentials
            }
        };
    }
}


    public static IEnumerable<TestUser> Get()
    {
        return new TestUser[]
        {
            new TestUser()
            {
                SubjectId = "1",
                Username = "[email protected]",
                Password = "password"
            }
        };
    }

ConfigureServices

    public void ConfigureServices(IServiceCollection services)
    {
        var pfxFilePath = Configuration.GetSection("Certificate:PfxFilePath");
        var pfxFilePassword = Configuration.GetSection("Certificate:Password");

        services.AddIdentityServer()
            .AddSigningCredential(new X509Certificate2(pfxFilePath.Value, pfxFilePassword.Value))
            .AddInMemoryClients(Clients.Get())
            .AddInMemoryApiResources(ApiRecourses.Get())
            .AddTestUsers(TestUsers.Get().ToList());

        services.AddMvc();
    }

Configure

    // 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)
    {
        loggerFactory.AddConsole();

        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseIdentityServer();
        app.UseStaticFiles();
        app.UseMvcWithDefaultRoute();
    }