[![Message error]] [1]: https://i.sstatic.net/ciKCK.png
My point is if someone go to Authorize page without login, It will be redirected to the login page.
This is my code (.NET Core 3.1):
My Controller
    [Authorize]
    public IActionResult Username()
    {
        var lstUsername = _dbContext.MT_USERNAME.ToList();
        return View(lstUsername);
    }
My Startup.cs
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddDbContext<GPServiceDbContext>(options =>
        {
            options.UseSqlServer(xxx);
        });
        services.AddControllersWithViews();
        services.AddSession(options =>
        {
            options.IdleTimeout = TimeSpan.FromMinutes(1);   
        });
    }
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
            app.UseHsts();
        }
        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseRouting();
        app.UseAuthentication();
        app.UseStatusCodePages(context =>
        {
            var response = context.HttpContext.Response;
            if (response.StatusCode == (int)HttpStatusCode.Unauthorized ||
                response.StatusCode == (int)HttpStatusCode.Forbidden)
                response.Redirect("/Login/Login");
            return Task.CompletedTask;
        });
        app.UseAuthorization();
        app.UseSession();
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllerRoute(
                name: "default",
                pattern: "{controller=Login}/{action=Login}/{id?}");
        });
    }
In my case there was just a simple error on authentication options parameter
options.DefaultAuthenticateScheme
instead of this:
options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
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