Problem with multiplayer and added cdkey (Neverwinter Nights)

They were going to fly in with the guys to go through the campaign. There was a problem, when creating the server, it says that the sd-key is incorrect. I tried to change it with a keygen three times, the problem is the same, there is a version in Steam, the situation is absolutely the same, according to one of the manuals (in the same Steam) I deleted the cdkey file, now it asks to enter whether it makes sense to use the keygen and generate a new one, or should I do something else? I tried to block the connection to the biovar server, there is a problem with the rights and the file itself, which had to be edited. If I manage to get to the creation of the server, I will add screenshots for understanding.
Another off-topic question, I recently got acquainted with the game, they write about addons on the forums, explain what kind of addons and where to buy them?