Myth/Auth - Routing problem

I can't see what I'm doing wrong here, as everything I've read seems to say this SHOULD work.  I'm filtering routes to the User controller, and the controller index method does NOT work, while the profile method works fine.  I'm lost...

Very basic implementation here:

App\Controllers\User.php

PHP Code:

<?php namespace App\Controllers;

class User extends Auth
{
    public function index()
    {
           echo "Test index";
    }
        
        public function profile()
    {
           echo "Test profile";
    }
} 


App\Config\Routes.php

PHP Code:

//Restricted to logged in users
$routes->group('user', ['filter' => 'role:Users'], function($routes) {
    $routes->get('user', 'User::index'); // Does NOT work
    $routes->get('profile', 'User::profile');  //Works Correctly
});