Why doesn't QHotkey work on the widget?

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Hello! I can't get QHotkey to work on the widget.
If I use the example code from ReadMe in EntryPoint.cpp, the hotkey works but if I use the same code in WMain.cpp it hotkey no longer works.

EntryPoint.cpp --> WORKS

int main(int argc, char* argv[])
{
	QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
	qputenv("QT_AUTO_SCREEN_SCALE_FACTOR", "1");
	qputenv("QT_FONT_DPI", "96");

	QApplication qApplication(argc, argv);

	QHotkey hotkey(QKeySequence("Ctrl+Q"), true, &qApplication);
	QObject::connect(&hotkey, &QHotkey::activated, qApp, [&]() { qApp->quit(); });

	WMain wMain;
	wMain.show();

	return qApplication.exec();
}

WMain.cpp --> DOESNT WORK

WMain::WMain(QWidget* parent) : QMainWindow(parent, Qt::FramelessWindowHint)
{
	this->UI_WMain.setupUi(this);

	this->setAttribute(Qt::WA_TranslucentBackground);
	
	this->qGraphicsDropShadowEffect->setBlurRadius(10);
	this->qGraphicsDropShadowEffect->setColor(QColor(0, 0, 0));
	this->qGraphicsDropShadowEffect->setOffset(0);
	this->UI_WMain.widgetMainFrameless->setGraphicsEffect(this->qGraphicsDropShadowEffect);

	QHotkey hotkey(QKeySequence("Ctrl+Q"), true, this);
	QObject::connect(&hotkey, &QHotkey::activated, qApp, [&]() { qApp->quit(); });
}

What am I doing wrong?