I have just bought NWN EE and want to play it via LAN. When I first started the game, it said I needed a CD key so i input the NWN CD key i saw from GOG -> NWN -> more -> Serial keys.

I saw the option for the other expansions as well.

Now when I start a multiplayer game for LAN, it says that my CD key is unauthorised. I thought, well maybe I should've used the Shadows of Undertide serial, but I can't seem to find where to re-input the CD key. I've also tried re-installing the game but it doesn't ask for the CD key anymore, but still says I have an invalid one.

Any help on this one would be appreciated.