I seem to be having a similar problem. I have a ip reservation for my dappnode and 1194/8092 port forwarding to the address. Dappnode webUI indicates ip address found and NAT is open but ports are not opening. I have geth syncing and was running testnet in this configuration so there doesn’t seem to be any problems.
The ports were opened at one time before a restart, so i’m unsure why they are not opening now. The dappnode UI does not recognize UPnP despite it being enabled on the router and with no addresses shown in the router UI.