EDIT: I did find the code in a comment from 505 Games in the Steam patch notes, but opting in didn’t do anything since the main and beta branches have been merged.
I noticed in the recent Steam update that there is a beta version of the game available. I first heard of this game after it came out in Early Access, so I have not beta tested previously.
I searched, but couldn’t find anything about the Steam code to get access to the private beta. Is there a way to gain access to the beta branch?