PySide6 - Connect to DBus signal - Correct syntax

[Drexel]

Hello,

can you help me with the correct syntax to connect to a DBus signal?

This is one of my many tries which at least runs and matches the signature in the docs:

class MainWindow(QMainWindow):
    __slots__ = ["__mainwidget"]
    __mainwidget:QWidget

    def __init__ (self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        service = 'org.freedesktop.DBus'
        path = '/org/freedesktop/DBus'
        iface = 'org.freedesktop.DBus'
        conn = QtDBus.QDBusConnection.systemBus()
        conn.connect(service, path, iface, "NameOwnerChanged", self, "nochangeslot")
        #smp = QtDBus.QDBusInterface(service, path, iface, connection=QtDBus.QDBusConnection.systemBus()


    def nochangeslot(self, arg:object) -> None:
        print(arg)
        pass

But it doesn't work and looks weird with the slot as string...

On the output I see:
qt.dbus.integration: Could not connect "org.freedesktop.DBus" to ochangeslot

Thank you in advance for any help!