Anyone having trouble with Zotify and the like?

I know that recently Spotify requires a credentials.json file and not just a user name and password. I can’t seem to find a method though that works in creating that file. I’ve tried librespot and librespot-auth, both of which should expose themselves as a speaker on my network for Spotify to cast too but it doesn’t show up. I’ve tried them both in a WSL instance and compiled directly for Windows with no luck.

Is there another way I’m missing to generate those credentials? I have a valid account, so I know there’s not an issue there.