Adding settings link to plugin doesn’t work

The code is working and tested. Activate your plugin you will see the settings link

add_filter( 'plugin_action_links_' . plugin_basename(__FILE__), 'apd_settings_link' );
function apd_settings_link( array $links ) {
    $url = get_admin_url() . "options-general.php?page=my-plugin";
    $settings_link = '<a href="' . $url . '">' . __('Settings', 'textdomain') . '</a>';
      $links[] = $settings_link;
    return $links;
  }

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