wp_login_url not working correctly

add_options_page( $page_title,  $menu_title,  $capability,      $menu_slug,      $function);
add_options_page( 'Login',      'Login Page', 'manage_options', 'loop.php?url=".esc_url($login_url)."');

You’re trying to feed a URL to an option that takes only a slug.

$menu_slug
(string) (required) The slug name to refer to this menu by (should be unique for this menu).
Default: None

from http://codex.wordpress.org/Function_Reference/add_options_page

You can easily add a link to the admin bar at the top of the screen:

add_action( 'admin_bar_menu', 'toolbar_link_to_mypage', 999 );

function toolbar_link_to_mypage( $wp_admin_bar ) {
  $args = array(
      'id'    => 'my_page',
      'title' => 'My Page',
      'href'  => 'http://mysite.com/my-page/',
      'meta'  => array( 'class' => 'my-toolbar-page' )
  );
  $wp_admin_bar->add_node( $args );
}

( https://wordpress.org/support/topic/adding-a-admin-menu-item-that-links-to-a-url )

I’ve been going through http://codex.wordpress.org/Administration_Menus and it appears that you might not be able to hardcode a link in the admin menu. Every function requires a slug to an existing page.

Could you create an options page and have the link there instead?

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