I was able to get past the initial key prompt with a key from here: https://alt.games.neverwinter-nights.narkive.com/wcVZcdsd/cd-key-for-nwn

When I try to start the session though, I think it still connects to a server to verify and I’m unauthorized to proceed any further.

I tried adding the changes you mentioned, but it did not work. This is an old game, so maybe it’s connecting to a different set of servers for verification. I don’t know how to check which servers are being pinged, though.