Laravel 5.4 Route is not working

I am new in Laravel. I use Laravel 5.4.

My Route file is :

Route::get('/', function () {
    return view('welcome');
});

Auth::routes();
Route::group(['middleware' => 'auth'], function () {
    Route::group(['prefix' => 'admin'], function () {
        Route::get('/', 'HomeController@index')->name('dashboard');
        Route::get('home', 'HomeController@index')->name('home');
        Route::get('/users', 'UserController@index')->name('users');
    });
});

When I use url in browser admin/home its working , but When I just use admin/ it redirecting me to Welcome page.

simply it's not working when I use url http://appurl/admin/ but it is working when I use http://appurl/admin/home When I am wrong ?

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