Returns 401 error code when user is not authorized in ASP MVC or Razor Pages

ApiAuthorizeAttribute.cs

public class ApiAuthorizeAttribute : TypeFilterAttribute {
    public ApiAuthorizeAttribute() : base(typeof(ApiAuthorizeFilter)) {
    }
}

public class ApiAuthorizeFilter : IAuthorizationFilter {
    public void OnAuthorization(AuthorizationFilterContext context) {
        if (context.HttpContext.User.Identity is not null &&
            !context.HttpContext.User.Identity.IsAuthenticated) {
            // Return a 401 Unauthorized status code
            context.Result = new UnauthorizedResult();
        }
    }
}

//TODO: Do not forget to add the service to the Program.cs
//builder.Services.AddScoped<ApiAuthorizeFilter>();