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How to get parameter from dynamic route in route subscriber

I am trying to restrict access for non admin users on structure->menues so that they can’t create any new links there.
Now they asked me if for the special menu "Focus" they could have the "Add Link" feature re enabled. I can get the menu->id() in the module file but somehow not in the routesubscriber. Drush CR returns an

PHP Fatal error:  Uncaught Error: Call to a member function id() on null in /var/www/html/web/modules/custom/my_menu/src/Routing/RouteSubscriber.php:31                                                                                                                 Stack trace:                                                                                                                                                                                                                                                            #0 /var/www/html/web/core/lib/Drupal/Core/Routing/RouteSubscriberBase.php(37): Drupalhw_menuRoutingRouteSubscriber->alterRoutes(Object(SymfonyComponentRoutingRouteCollection))                                                                                   #1 [internal function]: DrupalCoreRoutingRouteSubscriberBase->onAlterRoutes(Object(DrupalCoreRoutingRouteBuildEvent), 'routing.route_a...', Object(DrupalComponentEventDispatcherContainerAwareEventDispatcher))                                               #2 /var/www/html/web/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php(142): call_user_func(Array, Object(DrupalCoreRoutingRouteBuildEvent), 'routing.route_a...', Object(DrupalComponentEventDispatcherContainerAwareEventDispatcher)) #3 /var/www/html/web/core/lib/Drupal/Core/Routing/RouteBuilder.php(189): DrupalComponentEventDispatcherContainerAwareEventDispatcher->dispatch(Object(DrupalCoreRoutingRouteBuildEvent), 'routing.route_a...')                                                     in /var/www/html/web/modules/custom/my_menu/src/Routing/RouteSubscriber.php on line 31

Are there other ways to get the value?
Here is my code.

<?php  namespace Drupalmy_menuRouting;  use DrupalCoreRoutingRouteSubscriberBase; use DrupalCoreRoutingRoutingEvents; use SymfonyComponentRoutingRouteCollection; use DrupalCoreRoutingRouteMatchInterface;  /**  * Class RouteSubscriber  *  * hiding menu editing components for non-admins  *  * @package Drupalhw_menuRouting  */ class RouteSubscriber extends RouteSubscriberBase {    /**    * {@inheritdoc}    */   public function alterRoutes(RouteCollection $collection) {       if ($route = $collection->get('entity.menu.add_link_form')) {    //    dpm($route->getRequirements());        $menu instanceof DrupalsystemEntityMenu;       $menu = Drupal::routeMatch()->getParameter('menu');       if($menu->id() != 'focus') {         $route->setRequirement('_role', 'administrator');       }     //  dpm($route->getRequirements());     }    }    /**    * {@inheritdoc}    */   public static function getSubscribedEvents() {     // Run after content_translation, which has priority -210.     $events[RoutingEvents::ALTER] = ['onAlterRoutes', -230];     return $events;   }  }
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How to get parameter from dynamic route in route subscriber

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