diff --git a/Telegram/SourceFiles/main/main_session.cpp b/Telegram/SourceFiles/main/main_session.cpp
index 0ec2f632e2..2aebd8bc4c 100644
--- a/Telegram/SourceFiles/main/main_session.cpp
+++ b/Telegram/SourceFiles/main/main_session.cpp
@@ -165,6 +165,14 @@ base::Observable<void> &Session::downloaderTaskFinished() {
 	return downloader().taskFinished();
 }
 
+uint64 Session::uniqueId() const {
+	auto result = uint64(uint32(userId()));
+	if (mtp().isTestMode()) {
+		result |= 0x0100'0000'0000'0000ULL;
+	}
+	return result;
+}
+
 UserId Session::userId() const {
 	return _user->bareId();
 }
diff --git a/Telegram/SourceFiles/main/main_session.h b/Telegram/SourceFiles/main/main_session.h
index f1edc4e077..4962508025 100644
--- a/Telegram/SourceFiles/main/main_session.h
+++ b/Telegram/SourceFiles/main/main_session.h
@@ -80,6 +80,7 @@ public:
 	[[nodiscard]] Domain &domain() const;
 	[[nodiscard]] Storage::Domain &domainLocal() const;
 
+	[[nodiscard]] uint64 uniqueId() const; // userId() with TestDC shift.
 	[[nodiscard]] UserId userId() const;
 	[[nodiscard]] PeerId userPeerId() const;
 	[[nodiscard]] not_null<UserData*> user() const {
diff --git a/Telegram/SourceFiles/platform/linux/notifications_manager_linux.cpp b/Telegram/SourceFiles/platform/linux/notifications_manager_linux.cpp
index 5400eb326f..df70df966d 100644
--- a/Telegram/SourceFiles/platform/linux/notifications_manager_linux.cpp
+++ b/Telegram/SourceFiles/platform/linux/notifications_manager_linux.cpp
@@ -205,22 +205,18 @@ QString GetImageKey(const QVersionNumber &specificationVersion) {
 } // namespace
 
 NotificationData::NotificationData(
-		const base::weak_ptr<Manager> &manager,
-		const QString &title,
-		const QString &subtitle,
-		const QString &msg,
-		PeerId peerId,
-		MsgId msgId,
-		UserId selfId,
-		bool hideReplyButton)
+	const base::weak_ptr<Manager> &manager,
+	const QString &title,
+	const QString &subtitle,
+	const QString &msg,
+	NotificationId id,
+	bool hideReplyButton)
 : _dbusConnection(QDBusConnection::sessionBus())
 , _manager(manager)
 , _title(title)
 , _imageKey(GetImageKey(ParseSpecificationVersion(
 	GetServerInformation())))
-, _peerId(peerId)
-, _msgId(msgId)
-, _selfId(selfId) {
+, _id(id) {
 	const auto capabilities = GetCapabilities();
 
 	if (capabilities.contains(qsl("body-markup"))) {
@@ -377,14 +373,10 @@ void NotificationData::setImage(const QString &imagePath) {
 	_hints[_imageKey] = QVariant::fromValue(imageData);
 }
 
-NotificationData::NotificationId NotificationData::myId() const {
-	return { .peerId = _peerId, .msgId = _msgId, .selfId = _selfId };
-}
-
 void NotificationData::notificationClosed(uint id) {
 	if (id == _notificationId) {
 		const auto manager = _manager;
-		const auto my = myId();
+		const auto my = _id;
 		crl::on_main(manager, [=] {
 			manager->clearNotification(my);
 		});
@@ -399,13 +391,13 @@ void NotificationData::actionInvoked(uint id, const QString &actionName) {
 	if (actionName == qsl("default")
 		|| actionName == qsl("mail-reply-sender")) {
 		const auto manager = _manager;
-		const auto my = myId();
+		const auto my = _id;
 		crl::on_main(manager, [=] {
 			manager->notificationActivated(my);
 		});
 	} else if (actionName == qsl("mail-mark-read")) {
 		const auto manager = _manager;
-		const auto my = myId();
+		const auto my = _id;
 		crl::on_main(manager, [=] {
 			manager->notificationReplied(my, {});
 		});
@@ -415,7 +407,7 @@ void NotificationData::actionInvoked(uint id, const QString &actionName) {
 void NotificationData::notificationReplied(uint id, const QString &text) {
 	if (id == _notificationId) {
 		const auto manager = _manager;
-		const auto my = myId();
+		const auto my = _id;
 		crl::on_main(manager, [=] {
 			manager->notificationReplied(my, { text, {} });
 		});
@@ -541,17 +533,16 @@ void Manager::Private::showNotification(
 		bool hideReplyButton) {
 	if (!Supported()) return;
 
-	const auto peerId = peer->id;
-	const auto selfId = peer->session().userId();
-	const auto key = FullPeer{ peerId, selfId };
+	const auto key = FullPeer{
+		.sessionId = peer->session().uniqueId(),
+		.peerId = peer->id
+	};
 	auto notification = std::make_shared<NotificationData>(
 		_manager,
 		title,
 		subtitle,
 		msg,
-		peer->id,
-		msgId,
-		peer->session().userId(),
+		NotificationId{ .full = key, .msgId = msgId },
 		hideReplyButton);
 
 	if (!hideNameAndPhoto) {
@@ -601,8 +592,8 @@ void Manager::Private::clearFromHistory(not_null<History*> history) {
 	if (!Supported()) return;
 
 	const auto key = FullPeer{
-		history->peer->id,
-		history->session().userId()
+		.sessionId = history->session().uniqueId(),
+		.peerId = history->peer->id
 	};
 	auto i = _notifications.find(key);
 	if (i != _notifications.cend()) {
@@ -618,9 +609,9 @@ void Manager::Private::clearFromHistory(not_null<History*> history) {
 void Manager::Private::clearFromSession(not_null<Main::Session*> session) {
 	if (!Supported()) return;
 
-	const auto selfId = session->userId();
+	const auto sessionId = session->uniqueId();
 	for (auto i = _notifications.begin(); i != _notifications.end();) {
-		if (i->first.second == selfId) {
+		if (i->first.sessionId == sessionId) {
 			const auto temp = base::take(i->second);
 			i = _notifications.erase(i);
 
@@ -634,7 +625,7 @@ void Manager::Private::clearFromSession(not_null<Main::Session*> session) {
 void Manager::Private::clearNotification(NotificationId id) {
 	if (!Supported()) return;
 
-	auto i = _notifications.find(FullPeer{ id.peerId, id.selfId });
+	auto i = _notifications.find(id.full);
 	if (i != _notifications.cend()) {
 		if (i->second.remove(id.msgId) && i->second.empty()) {
 			_notifications.erase(i);
diff --git a/Telegram/SourceFiles/platform/linux/notifications_manager_linux.h b/Telegram/SourceFiles/platform/linux/notifications_manager_linux.h
index c24ec30cb7..bc318111ae 100644
--- a/Telegram/SourceFiles/platform/linux/notifications_manager_linux.h
+++ b/Telegram/SourceFiles/platform/linux/notifications_manager_linux.h
@@ -31,9 +31,7 @@ public:
 		const QString &title,
 		const QString &subtitle,
 		const QString &msg,
-		PeerId peerId,
-		MsgId msgId,
-		UserId selfId,
+		NotificationId id,
 		bool hideReplyButton);
 
 	NotificationData(const NotificationData &other) = delete;
@@ -53,8 +51,6 @@ public:
 	};
 
 private:
-	[[nodiscard]] NotificationId myId() const;
-
 	QDBusConnection _dbusConnection;
 	base::weak_ptr<Manager> _manager;
 
@@ -65,14 +61,13 @@ private:
 	QString _imageKey;
 
 	uint _notificationId = 0;
-	PeerId _peerId = 0;
-	MsgId _msgId = 0;
-	UserId _selfId = 0;
+	NotificationId _id;
 
 private slots:
 	void notificationClosed(uint id);
 	void actionInvoked(uint id, const QString &actionName);
 	void notificationReplied(uint id, const QString &text);
+
 };
 
 using Notification = std::shared_ptr<NotificationData>;
diff --git a/Telegram/SourceFiles/platform/mac/notifications_manager_mac.mm b/Telegram/SourceFiles/platform/mac/notifications_manager_mac.mm
index 054c402c0b..9db0ab40d3 100644
--- a/Telegram/SourceFiles/platform/mac/notifications_manager_mac.mm
+++ b/Telegram/SourceFiles/platform/mac/notifications_manager_mac.mm
@@ -92,10 +92,10 @@ NSImage *qt_mac_create_nsimage(const QPixmap &pm);
 		return;
 	}
 
-	NSNumber *selfObject = [notificationUserInfo objectForKey:@"self"];
-	const auto notificationSelfId = selfObject ? [selfObject intValue] : 0;
-	if (!notificationSelfId) {
-		LOG(("App Error: A notification with unknown self was received"));
+	NSNumber *sessionObject = [notificationUserInfo objectForKey:@"session"];
+	const auto notificationSessionId = sessionObject ? [sessionObject unsignedLongLongValue] : 0;
+	if (!notificationSessionId) {
+		LOG(("App Error: A notification with unknown session was received"));
 		return;
 	}
 	NSNumber *peerObject = [notificationUserInfo objectForKey:@"peer"];
@@ -109,9 +109,11 @@ NSImage *qt_mac_create_nsimage(const QPixmap &pm);
 	const auto notificationMsgId = msgObject ? [msgObject intValue] : 0;
 
 	const auto my = Window::Notifications::Manager::NotificationId{
-		.peerId = notificationPeerId,
-		.msgId = notificationMsgId,
-		.selfId = notificationSelfId
+		.full = FullPeer{
+			.sessionId = notificationSessionId,
+			.peerId = notificationPeerId
+		},
+		.msgId = notificationMsgId
 	};
 	if (notification.activationType == NSUserNotificationActivationTypeReplied) {
 		const auto notificationReply = QString::fromUtf8([[[notification response] string] UTF8String]);
@@ -207,7 +209,7 @@ private:
 		FullPeer fullPeer;
 	};
 	struct ClearFromSession {
-		UserId selfId = 0;
+		uint64 sessionId = 0;
 	};
 	struct ClearAll {
 	};
@@ -249,7 +251,7 @@ void Manager::Private::showNotification(
 		auto identifierValue = Q2NSString(identifier);
 		[notification setIdentifier:identifierValue];
 	}
-	[notification setUserInfo:[NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithUnsignedLongLong:peer->session().userId()],@"self",[NSNumber numberWithUnsignedLongLong:peer->id],@"peer",[NSNumber numberWithInt:msgId],@"msgid",[NSNumber numberWithUnsignedLongLong:_managerId],@"manager",nil]];
+	[notification setUserInfo:[NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithUnsignedLongLong:peer->session().uniqueId()],@"session",[NSNumber numberWithUnsignedLongLong:peer->id],@"peer",[NSNumber numberWithInt:msgId],@"msgid",[NSNumber numberWithUnsignedLongLong:_managerId],@"manager",nil]];
 
 	[notification setTitle:Q2NSString(title)];
 	[notification setSubtitle:Q2NSString(subtitle)];
@@ -279,7 +281,7 @@ void Manager::Private::clearingThreadLoop() {
 	while (!finished) {
 		auto clearAll = false;
 		auto clearFromPeers = base::flat_set<FullPeer>();
-		auto clearFromSessions = base::flat_set<UserId>();
+		auto clearFromSessions = base::flat_set<uint64>();
 		{
 			std::unique_lock<std::mutex> lock(_clearingMutex);
 
@@ -295,23 +297,26 @@ void Manager::Private::clearingThreadLoop() {
 				} else if (auto fromHistory = base::get_if<ClearFromHistory>(&task)) {
 					clearFromPeers.emplace(fromHistory->fullPeer);
 				} else if (auto fromSession = base::get_if<ClearFromSession>(&task)) {
-					clearFromSessions.emplace(fromSession->selfId);
+					clearFromSessions.emplace(fromSession->sessionId);
 				}
 			}
 			_clearingTasks.clear();
 		}
 
 		auto clearBySpecial = [&](NSDictionary *notificationUserInfo) {
-			NSNumber *selfObject = [notificationUserInfo objectForKey:@"self"];
-			const auto notificationSelfId = selfObject ? [selfObject intValue] : 0;
-			if (!notificationSelfId) {
+			NSNumber *sessionObject = [notificationUserInfo objectForKey:@"session"];
+			const auto notificationSessionId = sessionObject ? [sessionObject unsignedLongLongValue] : 0;
+			if (!notificationSessionId) {
 				return true;
 			}
 			if (NSNumber *peerObject = [notificationUserInfo objectForKey:@"peer"]) {
 				const auto notificationPeerId = [peerObject unsignedLongLongValue];
 				if (notificationPeerId) {
-					return clearFromSessions.contains(notificationSelfId)
-						|| clearFromPeers.contains(FullPeer{ notificationPeerId, notificationSelfId });
+					return clearFromSessions.contains(notificationSessionId)
+						|| clearFromPeers.contains(FullPeer{
+							.sessionId = notificationSessionId,
+							.peerId = notificationPeerId
+						});
 				}
 			}
 			return true;
@@ -348,11 +353,14 @@ void Manager::Private::clearAll() {
 }
 
 void Manager::Private::clearFromHistory(not_null<History*> history) {
-	putClearTask(ClearFromHistory { FullPeer{ history->peer->id, history->session().userId() } });
+	putClearTask(ClearFromHistory { FullPeer{
+		.sessionId = history->session().uniqueId(),
+		.peerId = history->peer->id
+	} });
 }
 
 void Manager::Private::clearFromSession(not_null<Main::Session*> session) {
-	putClearTask(ClearFromSession { session->userId() });
+	putClearTask(ClearFromSession { session->uniqueId() });
 }
 
 void Manager::Private::updateDelegate() {
diff --git a/Telegram/SourceFiles/platform/win/notifications_manager_win.cpp b/Telegram/SourceFiles/platform/win/notifications_manager_win.cpp
index d5d9d93c60..f5cfdf51d1 100644
--- a/Telegram/SourceFiles/platform/win/notifications_manager_win.cpp
+++ b/Telegram/SourceFiles/platform/win/notifications_manager_win.cpp
@@ -214,12 +214,8 @@ public:
 	// We keep a weak pointer to a member field of native notifications manager.
 	ToastEventHandler(
 		const std::shared_ptr<Manager*> &guarded,
-		PeerId peer,
-		MsgId msg,
-		UserId selfId)
-	: _peerId(peer)
-	, _msgId(msg)
-	, _selfId(selfId)
+		NotificationId id)
+	: _id(id)
 	, _weak(guarded) {
 	}
 
@@ -232,7 +228,7 @@ public:
 
 	// DesktopToastActivatedEventHandler
 	IFACEMETHODIMP Invoke(_In_ IToastNotification *sender, _In_ IInspectable* args) {
-		const auto my = myId();
+		const auto my = _id;
 		performOnMainQueue([my](Manager *manager) {
 			manager->notificationActivated(my);
 		});
@@ -249,7 +245,7 @@ public:
 			case ToastDismissalReason_UserCanceled:
 			case ToastDismissalReason_TimedOut:
 			default:
-				const auto my = myId();
+				const auto my = _id;
 				performOnMainQueue([my](Manager *manager) {
 					manager->clearNotification(my);
 				});
@@ -261,7 +257,7 @@ public:
 
 	// DesktopToastFailedEventHandler
 	IFACEMETHODIMP Invoke(_In_ IToastNotification *sender, _In_ IToastFailedEventArgs *e) {
-		const auto my = myId();
+		const auto my = _id;
 		performOnMainQueue([my](Manager *manager) {
 			manager->clearNotification(my);
 		});
@@ -301,14 +297,8 @@ public:
 	}
 
 private:
-	[[nodiscard]] NotificationId myId() const {
-		return { .peerId = _peerId, .msgId = _msgId, .selfId = _selfId };
-	}
-
 	ULONG _refCount = 0;
-	PeerId _peerId = 0;
-	MsgId _msgId = 0;
-	UserId _selfId = 0;
+	NotificationId _id;
 	std::weak_ptr<Manager*> _weak;
 
 };
@@ -439,8 +429,8 @@ void Manager::Private::clearFromHistory(not_null<History*> history) {
 	if (!_notifier) return;
 
 	auto i = _notifications.find(FullPeer{
-		history->peer->id,
-		history->session().userId()
+		.sessionId = history->session().uniqueId(),
+		.peerId = history->peer->id
 	});
 	if (i != _notifications.cend()) {
 		auto temp = base::take(i->second);
@@ -455,9 +445,9 @@ void Manager::Private::clearFromHistory(not_null<History*> history) {
 void Manager::Private::clearFromSession(not_null<Main::Session*> session) {
 	if (!_notifier) return;
 
-	const auto selfId = session->userId();
+	const auto sessionId = session->uniqueId();
 	for (auto i = _notifications.begin(); i != _notifications.end();) {
-		if (i->first.selfId == selfId) {
+		if (i->first.sessionId == sessionId) {
 			const auto temp = base::take(i->second);
 			_notifications.erase(i);
 
@@ -479,7 +469,7 @@ void Manager::Private::afterNotificationActivated(NotificationId id) {
 }
 
 void Manager::Private::clearNotification(NotificationId id) {
-	auto i = _notifications.find(FullPeer{ id.peerId, id.selfId });
+	auto i = _notifications.find(id.full);
 	if (i != _notifications.cend()) {
 		i->second.remove(id.msgId);
 		if (i->second.empty()) {
@@ -565,12 +555,19 @@ bool Manager::Private::showNotification(
 	hr = _notificationFactory->CreateToastNotification(toastXml.Get(), &toast);
 	if (!SUCCEEDED(hr)) return false;
 
+	const auto key = FullPeer{
+		.sessionId = peer->session().uniqueId(),
+		.peerId = peer->id,
+	};
+	const auto notificationId = NotificationId{
+		.full = key,
+		.msgId = msgId
+	};
+
 	EventRegistrationToken activatedToken, dismissedToken, failedToken;
 	ComPtr<ToastEventHandler> eventHandler(new ToastEventHandler(
 		_guarded,
-		peer->id,
-		msgId,
-		peer->session().userId()));
+		notificationId));
 
 	hr = toast->add_Activated(eventHandler.Get(), &activatedToken);
 	if (!SUCCEEDED(hr)) return false;
@@ -581,10 +578,6 @@ bool Manager::Private::showNotification(
 	hr = toast->add_Failed(eventHandler.Get(), &failedToken);
 	if (!SUCCEEDED(hr)) return false;
 
-	const auto key = FullPeer{
-		peer->id,
-		peer->session().userId()
-	};
 	auto i = _notifications.find(key);
 	if (i != _notifications.cend()) {
 		auto j = i->second.find(msgId);
diff --git a/Telegram/SourceFiles/window/notifications_manager.cpp b/Telegram/SourceFiles/window/notifications_manager.cpp
index 0eb9aa4d4e..73d428cb25 100644
--- a/Telegram/SourceFiles/window/notifications_manager.cpp
+++ b/Telegram/SourceFiles/window/notifications_manager.cpp
@@ -74,10 +74,10 @@ void System::createManager() {
 	}
 }
 
-Main::Session *System::findSession(UserId selfId) const {
+Main::Session *System::findSession(uint64 sessionId) const {
 	for (const auto &[index, account] : Core::App().domain().accounts()) {
 		if (const auto session = account->maybeSession()) {
-			if (session->userId() == selfId) {
+			if (session->uniqueId() == sessionId) {
 				return session;
 			}
 		}
@@ -293,12 +293,13 @@ void System::checkDelayed() {
 }
 
 void System::showGrouped() {
-	if (const auto session = findSession(_lastHistorySelfId)) {
+	if (const auto session = findSession(_lastHistorySessionId)) {
 		if (const auto lastItem = session->data().message(_lastHistoryItemId)) {
 			_waitForAllGroupedTimer.cancel();
 			_manager->showNotification(lastItem, _lastForwardedCount);
 			_lastForwardedCount = 0;
 			_lastHistoryItemId = FullMsgId();
+			_lastHistorySessionId = 0;
 		}
 	}
 }
@@ -307,13 +308,17 @@ void System::showNext() {
 	if (App::quitting()) return;
 
 	const auto isSameGroup = [=](HistoryItem *item) {
-		if (!_lastHistoryItemId || !item) {
+		if (!_lastHistorySessionId || !_lastHistoryItemId || !item) {
+			return false;
+		} else if (item->history()->session().uniqueId()
+			!= _lastHistorySessionId) {
 			return false;
 		}
 		const auto lastItem = item->history()->owner().message(
 			_lastHistoryItemId);
 		if (lastItem) {
-			return (lastItem->groupId() == item->groupId() || lastItem->author() == item->author());
+			return (lastItem->groupId() == item->groupId())
+				|| (lastItem->author() == item->author());
 		}
 		return false;
 	};
@@ -476,6 +481,7 @@ void System::showNext() {
 				}
 
 				if (!_lastHistoryItemId && groupedItem) {
+					_lastHistorySessionId = groupedItem->history()->session().uniqueId();
 					_lastHistoryItemId = groupedItem->fullId();
 				}
 
@@ -493,6 +499,7 @@ void System::showNext() {
 					}
 					// We have to wait until all the messages in this group are loaded.
 					_lastForwardedCount += forwardedCount;
+					_lastHistorySessionId = groupedItem->history()->session().uniqueId();
 					_lastHistoryItemId = groupedItem->fullId();
 					_waitForAllGroupedTimer.callOnce(kWaitingForAllGroupedDelay);
 				} else {
@@ -567,13 +574,13 @@ QString Manager::accountNameSeparator() {
 
 void Manager::notificationActivated(NotificationId id) {
 	onBeforeNotificationActivated(id);
-	if (const auto session = system()->findSession(id.selfId)) {
+	if (const auto session = system()->findSession(id.full.sessionId)) {
 		if (session->windows().empty()) {
 			Core::App().domain().activate(&session->account());
 		}
 		if (!session->windows().empty()) {
 			const auto window = session->windows().front();
-			const auto history = session->data().history(id.peerId);
+			const auto history = session->data().history(id.full.peerId);
 			window->widget()->showFromTray();
 			window->widget()->reActivateWindow();
 			if (Core::App().passcodeLocked()) {
@@ -622,15 +629,15 @@ void Manager::openNotificationMessage(
 void Manager::notificationReplied(
 		NotificationId id,
 		const TextWithTags &reply) {
-	if (!id.selfId || !id.peerId) {
+	if (!id.full.sessionId || !id.full.peerId) {
 		return;
 	}
 
-	const auto session = system()->findSession(id.selfId);
+	const auto session = system()->findSession(id.full.sessionId);
 	if (!session) {
 		return;
 	}
-	const auto history = session->data().history(id.peerId);
+	const auto history = session->data().history(id.full.peerId);
 
 	auto message = Api::MessageToSend(history);
 	message.textWithTags = reply;
diff --git a/Telegram/SourceFiles/window/notifications_manager.h b/Telegram/SourceFiles/window/notifications_manager.h
index 4086ab55d4..13fbb0c440 100644
--- a/Telegram/SourceFiles/window/notifications_manager.h
+++ b/Telegram/SourceFiles/window/notifications_manager.h
@@ -67,7 +67,7 @@ public:
 	System();
 	~System();
 
-	[[nodiscard]] Main::Session *findSession(UserId selfId) const;
+	[[nodiscard]] Main::Session *findSession(uint64 sessionId) const;
 
 	void createManager();
 
@@ -126,27 +126,26 @@ private:
 	std::unique_ptr<Media::Audio::Track> _soundTrack;
 
 	int _lastForwardedCount = 0;
-	UserId _lastHistorySelfId = 0;
+	uint64 _lastHistorySessionId = 0;
 	FullMsgId _lastHistoryItemId;
 
 };
 
 class Manager {
 public:
-	struct NotificationId {
-		PeerId peerId = 0;
-		MsgId msgId = 0;
-		UserId selfId = 0;
-	};
 	struct FullPeer {
+		uint64 sessionId = 0;
 		PeerId peerId = 0;
-		UserId selfId = 0;
 
 		friend inline bool operator<(const FullPeer &a, const FullPeer &b) {
-			return std::tie(a.peerId, a.selfId)
-				< std::tie(b.peerId, b.selfId);
+			return std::tie(a.sessionId, a.peerId)
+				< std::tie(b.sessionId, b.peerId);
 		}
 	};
+	struct NotificationId {
+		FullPeer full;
+		MsgId msgId = 0;
+	};
 
 	explicit Manager(not_null<System*> system) : _system(system) {
 	}
diff --git a/Telegram/SourceFiles/window/notifications_manager_default.cpp b/Telegram/SourceFiles/window/notifications_manager_default.cpp
index c4b9117ca7..d9eba08a32 100644
--- a/Telegram/SourceFiles/window/notifications_manager_default.cpp
+++ b/Telegram/SourceFiles/window/notifications_manager_default.cpp
@@ -950,10 +950,10 @@ Notifications::Manager::NotificationId Notification::myId() const {
 	if (!_history) {
 		return {};
 	}
-	const auto selfId = _history->session().userId();
-	const auto peerId = _history->peer->id;
-	const auto msgId = _item ? _item->id : ShowAtUnreadMsgId;
-	return { .peerId = peerId, .msgId = msgId, .selfId = selfId };
+	return { .full = {
+		.sessionId = _history->session().uniqueId(),
+		.peerId = _history->peer->id
+	}, .msgId = _item ? _item->id : ShowAtUnreadMsgId };
 }
 
 void Notification::changeHeight(int newHeight) {