GL-AX1800 / Flint dont work with UPnP

I bought a Flitax 1800. Everything is wonderful, but unfortunately I can’t get a connection outside of my network with my QNAP NAS TS653A.
Upnp diesnt is installed but QNAP Cloud does not work from outside
Thx for you help/ideas

UPnP is an unsecure protocol and QNAP recommends not using it.

Mini version is installed by default may need another.