diff --git a/src/Bundle/ChillMainBundle/Tests/Workflow/EventSubscriber/NotificationOnTransitionTest.php b/src/Bundle/ChillMainBundle/Tests/Workflow/EventSubscriber/NotificationOnTransitionTest.php
index fed7f2dce..e2fc30da8 100644
--- a/src/Bundle/ChillMainBundle/Tests/Workflow/EventSubscriber/NotificationOnTransitionTest.php
+++ b/src/Bundle/ChillMainBundle/Tests/Workflow/EventSubscriber/NotificationOnTransitionTest.php
@@ -13,6 +13,7 @@ namespace Chill\MainBundle\Tests\Workflow\EventSubscriber;
 
 use Chill\MainBundle\Entity\Notification;
 use Chill\MainBundle\Entity\User;
+use Chill\MainBundle\Entity\UserGroup;
 use Chill\MainBundle\Entity\Workflow\EntityWorkflow;
 use Chill\MainBundle\Entity\Workflow\EntityWorkflowStep;
 use Chill\MainBundle\Workflow\EventSubscriber\NotificationOnTransition;
@@ -20,8 +21,6 @@ use Chill\MainBundle\Workflow\Helper\MetadataExtractor;
 use Doctrine\ORM\EntityManagerInterface;
 use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
-use Prophecy\Call\Call;
-use Prophecy\Exception\Prediction\FailedPredictionException;
 use Prophecy\PhpUnit\ProphecyTrait;
 use Symfony\Component\Security\Core\Security;
 use Symfony\Component\Workflow\Event\Event;
@@ -57,29 +56,23 @@ final class NotificationOnTransitionTest extends TestCase
         $id->setValue($entityWorkflow, 1);
 
         $step = new EntityWorkflowStep();
+        $userGroup = (new UserGroup())->addUser($userInGroup = new User())->addUser($dest);
         $entityWorkflow->addStep($step);
-        $step->addDestUser($dest)
+        $step
+            ->addDestUser($dest)
+            ->addDestUserGroup($userGroup)
             ->setCurrentStep('to_state');
 
         $em = $this->prophesize(EntityManagerInterface::class);
-        $em->persist(Argument::type(Notification::class))->should(
-            static function ($args) use ($dest) {
-                /** @var Call[] $args */
-                if (1 !== \count($args)) {
-                    throw new FailedPredictionException('no notification sent');
-                }
 
-                $notification = $args[0]->getArguments()[0];
-
-                if (!$notification instanceof Notification) {
-                    throw new FailedPredictionException('persist is not a notification');
-                }
-
-                if (!$notification->getAddressees()->contains($dest)) {
-                    throw new FailedPredictionException('the dest is not notified');
-                }
-            }
-        );
+        // we check that both notification has been persisted once,
+        // eliminating doublons
+        $em->persist(Argument::that(
+            fn ($notificationCandidate) => $notificationCandidate instanceof Notification && $notificationCandidate->getAddressees()->contains($dest)
+        ))->shouldBeCalledOnce();
+        $em->persist(Argument::that(
+            fn ($notificationCandidate) => $notificationCandidate instanceof Notification && $notificationCandidate->getAddressees()->contains($userInGroup)
+        ))->shouldBeCalledOnce();
 
         $engine = $this->prophesize(\Twig\Environment::class);
         $engine->render(Argument::type('string'), Argument::type('array'))
diff --git a/src/Bundle/ChillMainBundle/Workflow/EventSubscriber/NotificationOnTransition.php b/src/Bundle/ChillMainBundle/Workflow/EventSubscriber/NotificationOnTransition.php
index d955d777f..89ae65f4c 100644
--- a/src/Bundle/ChillMainBundle/Workflow/EventSubscriber/NotificationOnTransition.php
+++ b/src/Bundle/ChillMainBundle/Workflow/EventSubscriber/NotificationOnTransition.php
@@ -13,6 +13,7 @@ namespace Chill\MainBundle\Workflow\EventSubscriber;
 
 use Chill\MainBundle\Entity\Notification;
 use Chill\MainBundle\Entity\User;
+use Chill\MainBundle\Entity\UserGroup;
 use Chill\MainBundle\Entity\Workflow\EntityWorkflow;
 use Chill\MainBundle\Workflow\Helper\MetadataExtractor;
 use Doctrine\ORM\EntityManagerInterface;
@@ -69,7 +70,18 @@ class NotificationOnTransition implements EventSubscriberInterface
             // the dests for the current step
             $entityWorkflow->getCurrentStep()->getDestUser()->toArray(),
             // the cc users for the current step
-            $entityWorkflow->getCurrentStep()->getCcUser()->toArray()
+            $entityWorkflow->getCurrentStep()->getCcUser()->toArray(),
+            // the users within groups
+            $entityWorkflow->getCurrentStep()->getDestUserGroups()->reduce(
+                function (array $accumulator, UserGroup $userGroup) {
+                    foreach ($userGroup->getUsers() as $user) {
+                        $accumulator[] = $user;
+                    }
+
+                    return $accumulator;
+                },
+                []
+            ),
         ) as $dest) {
             $dests[spl_object_hash($dest)] = $dest;
         }