Second chime in, I'm talking to TP-Link support. There should be no reason why they don't open as they open fine on another router. I've had to switch to using UPnP in order to get the ports open....

Wanted to chime in here because the Deco X20 DSL and probably other Deco units as well have a port forwarding issue. I also had my Deco IP set to 192.168.68.1, Adding various ports to be forwarded...