QtWebEngine doesn't load HTML page

[Cyclotech]

Hi,
I try making work a QtWebEngine application with Qt6.5 but

QQuickView* windowMap = new QQuickView();
QQmlContext* context = windowMap->rootContext();
context->setContextProperty(QStringLiteral("MyUrl"), QUrl("myPage.html"));
myWindow->setSource(QUrl(QLatin1String("myQml.qml")));

unfortunately it works only if I run with Qt5.15.
Anyone has an idea?
Thank you
Regards