For Elgg 3:

1 - Try to use this plugin https://elgg.org/plugins/2991418

2 - Use this snippet code in elgg_plugin.php of your custom plugin to prevent access to Notifications page

return [

  'routes' => [
    'settings:notification:personal' => [
       'path' => '/notifications/personal/{username?}',
       'resource' => 'notifications/index',
       'middleware' => [
          \Elgg\Router\Middleware\AdminGatekeeper::class,
       ],
    ],

    'settings:notification:groups' => [
        'path' => '/notifications/group/{username?}',
        'resource' => 'notifications/groups',
        'required_plugins' => [
          'groups',
        ],
        'middleware' => [
            \Elgg\Router\Middleware\AdminGatekeeper::class,
        ],
    ],
  ],

];

Thanks mate, but the plugin is invalid as its missing some type of component.

Thanks again!

Bingo!! Absolutely great plugin

Tested on https://seochecker.it/pwa-tester-online Result 100% PWA ready

Sometimes developers don't have enough time to publish their plugins here, or they don't want to do it for some reason.

Time is our most common reason for forgetting to publish on the community ;)