Trouble Implementing Auth0 No authentication handlers are registered error

Hello I am getting the following error when trying to Login. On ASP.NET Core MVC app.

“InvalidOperationException: No authentication handlers are registered. Did you forget to call AddAuthentication().AddSomeAuthHandler?”

Below is my startup and account controller class

public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
            
        }

        public IConfiguration Configuration { get; }


        public void ConfigureServices(IServiceCollection services)
        {
            //services.ConfigureSameSiteNoneCookies();

            services.AddAuth0WebAppAuthentication(options => {
                options.Domain = Configuration["Auth0:Domain"];
                options.ClientId = Configuration["Auth0:ClientId"];
            });

            services.AddControllersWithViews();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                app.UseHsts();
            }

            app.UseStaticFiles();
            app.UseCookiePolicy();

            app.UseRouting();

            app.UseAuthentication();
            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapDefaultControllerRoute();
            });
        }
}
public class AccountController : Controller
    {
        public async Task Login(string returnUrl = "/")
        {
            var authenticationProperties = new LoginAuthenticationPropertiesBuilder()
                 .WithRedirectUri(returnUrl)
                 .Build();

            await HttpContext.ChallengeAsync(Auth0Constants.AuthenticationScheme, authenticationProperties);
        }

        [Authorize]
        public async Task Logout()
        {
            var authenticationProperties = new LogoutAuthenticationPropertiesBuilder()
                 // Indicate here where Auth0 should redirect the user after a logout.
                 // Note that the resulting absolute Uri must be whitelisted in 
                 .WithRedirectUri(Url.Action("Index", "Home"))
                 .Build();

            await HttpContext.SignOutAsync(Auth0Constants.AuthenticationScheme, authenticationProperties);
            await HttpContext.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
        }

        [Authorize]
        public IActionResult Profile()
        {
            return View(new UserProfileViewModel()
            {
                //Name = User.Identity.Name,
                EmailAddress = User.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Email)?.Value,
                //ProfileImage = User.Claims.FirstOrDefault(c => c.Type == "picture")?.Value
            });
        }

        /// <summary>
        /// This is just a helper action to enable you to easily see all claims related to a user. It helps when debugging your
        /// application to see the in claims populated from the Auth0 ID Token
        /// </summary>
        /// <returns></returns>

        public IActionResult Claims()
        {
            return View();
        }

        public IActionResult AccessDenied()
        {
            return View();
        }
    }

Hi @anamr,

Welcome to the Auth0 Community!

Can you please share your csproj and web.config?

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