diff --git a/lib/Controller/RoomController.php b/lib/Controller/RoomController.php
index 99cfdcd9335..d44f836762c 100644
--- a/lib/Controller/RoomController.php
+++ b/lib/Controller/RoomController.php
@@ -1855,6 +1855,7 @@ public function rejectedDialOutRequest(string $callId, array $options = []): Dat
 	 * 400: The provided new state was invalid
 	 * 404: The participant did not have a session
 	 */
+	#[FederationSupported]
 	#[PublicPage]
 	#[RequireParticipant]
 	public function setSessionState(int $state): DataResponse {
diff --git a/lib/Federation/CloudFederationProviderTalk.php b/lib/Federation/CloudFederationProviderTalk.php
index ab91e17d57c..af814ea3e74 100644
--- a/lib/Federation/CloudFederationProviderTalk.php
+++ b/lib/Federation/CloudFederationProviderTalk.php
@@ -441,7 +441,7 @@ private function messagePosted(int $remoteAttendeeId, array $notification): arra
 		}
 
 		try {
-			$participant = $this->participantService->getParticipant($room, $invite->getUserId(), false);
+			$participant = $this->participantService->getParticipantWithActiveSession($room, $invite->getUserId());
 		} catch (ParticipantNotFoundException) {
 			// Not accepted the invite yet
 			return [];
diff --git a/lib/Notification/FederationChatNotifier.php b/lib/Notification/FederationChatNotifier.php
index e4e9966b259..74eb21865e3 100644
--- a/lib/Notification/FederationChatNotifier.php
+++ b/lib/Notification/FederationChatNotifier.php
@@ -30,6 +30,7 @@
 use OCA\Talk\Model\Attendee;
 use OCA\Talk\Model\Message;
 use OCA\Talk\Model\ProxyCacheMessage;
+use OCA\Talk\Model\Session;
 use OCA\Talk\Participant;
 use OCA\Talk\Room;
 use OCP\AppFramework\Services\IAppConfig;
@@ -61,6 +62,11 @@ public function handleChatMessage(Room $room, Participant $participant, ProxyCac
 			return;
 		}
 
+		if ($participant->getSession() instanceof Session) {
+			// User has an active session
+			return;
+		}
+
 		// Also notify default participants in one-to-one chats or when the admin default is "always"
 		$defaultLevel = $this->appConfig->getAppValueInt('default_group_notification', Participant::NOTIFY_MENTION);
 		if ($participant->getAttendee()->getNotificationLevel() === Participant::NOTIFY_MENTION
diff --git a/lib/Service/ParticipantService.php b/lib/Service/ParticipantService.php
index f234f50977c..bbe5069aecf 100644
--- a/lib/Service/ParticipantService.php
+++ b/lib/Service/ParticipantService.php
@@ -1876,6 +1876,37 @@ public function getParticipant(Room $room, ?string $userId, $sessionId = null):
 		return $participant;
 	}
 
+	/**
+	 * Get a participant with an active session if there is one, otherwise without session
+	 *
+	 * @param Room $room
+	 * @param string $userId
+	 * @return Participant
+	 * @throws ParticipantNotFoundException When the user is not a participant
+	 */
+	public function getParticipantWithActiveSession(Room $room, string $userId): Participant {
+		if ($userId === '') {
+			throw new ParticipantNotFoundException('Not a user');
+		}
+
+		$query = $this->connection->getQueryBuilder();
+		$helper = new SelectHelper();
+		$helper->selectAttendeesTable($query);
+		$helper->selectSessionsTable($query);
+		$query->from('talk_attendees', 'a')
+			->leftJoin('a', 'talk_sessions', 's', $query->expr()->andX(
+				$query->expr()->eq('a.id', 's.attendee_id'),
+				$query->expr()->eq('s.state', $query->createNamedParameter(Session::STATE_ACTIVE, IQueryBuilder::PARAM_INT))
+			))
+			->where($query->expr()->eq('a.actor_type', $query->createNamedParameter(Attendee::ACTOR_USERS)))
+			->andWhere($query->expr()->eq('a.actor_id', $query->createNamedParameter($userId)))
+			->andWhere($query->expr()->eq('a.room_id', $query->createNamedParameter($room->getId())))
+			->setMaxResults(1);
+
+
+		return $this->getParticipantFromQuery($query, $room);
+	}
+
 	/**
 	 * @param Room $room
 	 * @param string|null $sessionId
diff --git a/tests/integration/features/federation/chat.feature b/tests/integration/features/federation/chat.feature
index 616e91ec749..9d3ebc4cc25 100644
--- a/tests/integration/features/federation/chat.feature
+++ b/tests/integration/features/federation/chat.feature
@@ -302,6 +302,37 @@ Feature: federation/chat
     Then user "participant2" has the following notifications
       | app    | object_type | object_id                | subject                                                                | message     |
 
+  Scenario: Mentioning a federated user with an active session does not trigger a notification but inactive does
+    Given the following "spreed" app config is set
+      | federation_enabled | yes |
+    Given user "participant1" creates room "room" (v4)
+      | roomType | 3 |
+      | roomName | room |
+    And user "participant1" adds federated_user "participant2" to room "room" with 200 (v4)
+    And user "participant2" has the following invitations (v1)
+      | remoteServerUrl | remoteToken | state | inviterCloudId                     | inviterDisplayName       |
+      | LOCAL           | room        | 0     | participant1@http://localhost:8080 | participant1-displayname |
+    And user "participant2" accepts invite to room "room" of server "LOCAL" with 200 (v1)
+      | id   | name | type | remoteServer | remoteToken |
+      | room | room | 3    | LOCAL        | room        |
+    Then user "participant2" is participant of the following rooms (v4)
+      | id   | type |
+      | room | 3    |
+    # Join and leave to clear the invite notification
+    Given user "participant2" joins room "LOCAL::room" with 200 (v4)
+    Given user "participant2" sets session state to 1 in room "LOCAL::room" with 200 (v4)
+    And user "guest" joins room "room" with 200 (v4)
+    When user "guest" sends message 'Sent to @"federated_user/participant2@{$REMOTE_URL}" while active' to room "room" with 201
+    Given user "participant2" sets session state to 0 in room "LOCAL::room" with 200 (v4)
+    When user "guest" sends message 'User @"federated_user/participant2@{$REMOTE_URL}" is inactive' to room "room" with 201
+    When user "guest" sends message "Message 3" to room "room" with 201
+    Then user "participant2" has the following notifications
+      | app    | object_type | object_id                | subject                                                                | message     |
+      | spreed | chat        | room/User @"federated_user/participant2@{$REMOTE_URL}" is inactive | A guest mentioned you in conversation room | User @participant2-displayname is inactive |
+    Then user "participant2" reads message "Message 3" in room "LOCAL::room" with 200 (v1)
+    Then user "participant2" has the following notifications
+      | app    | object_type | object_id                | subject                                                                | message     |
+
   Scenario: Mentioning a federated user as a federated user that is a local user to the mentioned one also triggers a notification for them
     Given the following "spreed" app config is set
       | federation_enabled | yes |