diff --git a/Command/AboutCommand.php b/Command/AboutCommand.php
index f4281cd21..4dc86130a 100644
--- a/Command/AboutCommand.php
+++ b/Command/AboutCommand.php
@@ -86,7 +86,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
             ['Timezone', date_default_timezone_get().' (<comment>'.(new \DateTimeImmutable())->format(\DateTimeInterface::W3C).'</>)'],
             ['OPcache', \extension_loaded('Zend OPcache') ? (filter_var(\ini_get('opcache.enable'), FILTER_VALIDATE_BOOLEAN) ? 'Enabled' : 'Not enabled') : 'Not installed'],
             ['APCu', \extension_loaded('apcu') ? (filter_var(\ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) ? 'Enabled' : 'Not enabled') : 'Not installed'],
-            ['Xdebug', \extension_loaded('xdebug') ? ($xdebugMode && $xdebugMode !== 'off' ? 'Enabled (' . $xdebugMode . ')' : 'Not enabled') : 'Not installed'],
+            ['Xdebug', \extension_loaded('xdebug') ? ($xdebugMode && 'off' !== $xdebugMode ? 'Enabled (' . $xdebugMode . ')' : 'Not enabled') : 'Not installed'],
         ];
 
         $io->table([], $rows);
diff --git a/DependencyInjection/FrameworkExtension.php b/DependencyInjection/FrameworkExtension.php
index 26cae1f30..a6d595603 100644
--- a/DependencyInjection/FrameworkExtension.php
+++ b/DependencyInjection/FrameworkExtension.php
@@ -310,10 +310,17 @@ public function load(array $configs, ContainerBuilder $container): void
             }
         }
 
+        $emptySecretHint = '"framework.secret" option';
         if (isset($config['secret'])) {
             $container->setParameter('kernel.secret', $config['secret']);
+            $usedEnvs = [];
+            $container->resolveEnvPlaceholders($config['secret'], null, $usedEnvs);
+
+            if ($usedEnvs) {
+                $emptySecretHint = \sprintf('"%s" env var%s', implode('", "', $usedEnvs), 1 === \count($usedEnvs) ? '' : 's');
+            }
         }
-        $container->parameterCannotBeEmpty('kernel.secret', 'A non-empty value for the parameter "kernel.secret" is required. Did you forget to configure the "framework.secret" option?');
+        $container->parameterCannotBeEmpty('kernel.secret', 'A non-empty value for the parameter "kernel.secret" is required. Did you forget to configure the '.$emptySecretHint.'?');
 
         $container->setParameter('kernel.http_method_override', $config['http_method_override']);
         $container->setParameter('kernel.trust_x_sendfile_type_header', $config['trust_x_sendfile_type_header']);
@@ -2777,7 +2784,7 @@ private function registerNotifierConfiguration(array $config, ContainerBuilder $
             $container->removeDefinition('notifier.channel.email');
         }
 
-        foreach (['texter', 'chatter', 'notifier.channel.chat', 'notifier.channel.email', 'notifier.channel.sms'] as $serviceId) {
+        foreach (['texter', 'chatter', 'notifier.channel.chat', 'notifier.channel.email', 'notifier.channel.sms', 'notifier.channel.push', 'notifier.channel.desktop'] as $serviceId) {
             if (!$container->hasDefinition($serviceId)) {
                 continue;
             }
diff --git a/Resources/config/notifier.php b/Resources/config/notifier.php
index 04fa4ce51..28900ad10 100644
--- a/Resources/config/notifier.php
+++ b/Resources/config/notifier.php
@@ -75,11 +75,17 @@
             ->tag('notifier.channel', ['channel' => 'email'])
 
         ->set('notifier.channel.push', PushChannel::class)
-            ->args([service('texter.transports'), service('messenger.default_bus')->ignoreOnInvalid()])
+            ->args([
+                service('texter.transports'),
+                abstract_arg('message bus'),
+            ])
             ->tag('notifier.channel', ['channel' => 'push'])
 
         ->set('notifier.channel.desktop', DesktopChannel::class)
-            ->args([service('texter.transports'), service('messenger.default_bus')->ignoreOnInvalid()])
+            ->args([
+                service('texter.transports'),
+                abstract_arg('message bus'),
+            ])
             ->tag('notifier.channel', ['channel' => 'desktop'])
 
         ->set('notifier.monolog_handler', NotifierHandler::class)
diff --git a/Resources/config/services.php b/Resources/config/services.php
index 53856f356..6abe1b6d8 100644
--- a/Resources/config/services.php
+++ b/Resources/config/services.php
@@ -157,6 +157,7 @@ class_exists(WorkflowEvents::class) ? WorkflowEvents::ALIASES : []
             ->args([
                 new Parameter('kernel.secret'),
             ])
+            ->lazy()
         ->alias(UriSigner::class, 'uri_signer')
 
         ->set('config_cache_factory', ResourceCheckerConfigCacheFactory::class)

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