diff --git a/lib/Service/ParticipantService.php b/lib/Service/ParticipantService.php
index d3270018965d..fc4c364dad5a 100644
--- a/lib/Service/ParticipantService.php
+++ b/lib/Service/ParticipantService.php
@@ -1622,6 +1622,13 @@ public function getParticipantUserIds(Room $room, ?\DateTime $maxLastJoined = nu
 		return $this->getParticipantActorIdsByActorType($room, Attendee::ACTOR_USERS, $maxLastJoined);
 	}
 
+	/**
+	 * @return string[]
+	 */
+	public function getFederatedParticipantCloudIds(Room $room, ?\DateTime $maxLastJoined = null): array {
+		return $this->getParticipantActorIdsByActorType($room, Attendee::ACTOR_FEDERATED_USERS, $maxLastJoined);
+	}
+
 	/**
 	 * @return string[]
 	 */
diff --git a/lib/Signaling/BackendNotifier.php b/lib/Signaling/BackendNotifier.php
index 38719bf76e50..ac36086340b2 100644
--- a/lib/Signaling/BackendNotifier.php
+++ b/lib/Signaling/BackendNotifier.php
@@ -142,6 +142,8 @@ private function backendRequest(Room $room, array $data): ?IResponse {
 	 * @throws \Exception
 	 */
 	public function roomInvited(Room $room, array $attendees): void {
+		$allUserIds = $this->participantService->getParticipantUserIds($room);
+		$allUserIds = array_merge($allUserIds, $this->participantService->getFederatedParticipantCloudIds($room));
 		$userIds = [];
 		foreach ($attendees as $attendee) {
 			if ($attendee->getActorType() === Attendee::ACTOR_USERS) {
@@ -155,7 +157,7 @@ public function roomInvited(Room $room, array $attendees): void {
 				'userids' => $userIds,
 				// TODO(fancycode): We should try to get rid of 'alluserids' and
 				// find a better way to notify existing users to update the room.
-				'alluserids' => $this->participantService->getParticipantUserIds($room),
+				'alluserids' => $allUserIds,
 				'properties' => $room->getPropertiesForSignaling('', false),
 			],
 		]);
@@ -177,6 +179,7 @@ public function roomInvited(Room $room, array $attendees): void {
 	 */
 	public function roomsDisinvited(Room $room, array $attendees): void {
 		$allUserIds = $this->participantService->getParticipantUserIds($room);
+		$allUserIds = array_merge($allUserIds, $this->participantService->getFederatedParticipantCloudIds($room));
 		sort($allUserIds);
 		$userIds = [];
 		foreach ($attendees as $attendee) {
@@ -213,6 +216,7 @@ public function roomsDisinvited(Room $room, array $attendees): void {
 	 */
 	public function roomSessionsRemoved(Room $room, array $sessionIds): void {
 		$allUserIds = $this->participantService->getParticipantUserIds($room);
+		$allUserIds = array_merge($allUserIds, $this->participantService->getFederatedParticipantCloudIds($room));
 		sort($allUserIds);
 		$start = microtime(true);
 		$this->backendRequest($room, [
@@ -245,6 +249,9 @@ public function roomModified(Room $room): void {
 		$this->backendRequest($room, [
 			'type' => 'update',
 			'update' => [
+				// Message not sent for federated users, as they will receive
+				// the message from their federated Nextcloud server once the
+				// property change is propagated.
 				'userids' => $this->participantService->getParticipantUserIds($room),
 				'properties' => $room->getPropertiesForSignaling(''),
 			],