Hi buddy. A pleasure to greet you today. I recommend that you verify that you are exporting the libraries correctly, and that you have the version of NW updated to a version compatible with SteamLink (v49.2) It should work correctly. I use this plugin for my game, and in my case it works perfectly both in the editor and exporting the game.
How are you. Don't worry, I'm glad you were able to fix it!
I want to tell you that I am currently researching and using in my game an additional plugin that came out very recently:
I leave you his Itchio in case you want to take a look:
https://rabbitteaparty.itch.io/nekogakuen-steamworksapi
Mainly it fixes the Achievements system that for some reason SteamLink was not working, and adds other additional features.
I recommend that you review it and try to see what you think.