git-crypt fails to unlock encrypted files upon cloning new repo in production server

I'm attempting to clone my repo in a production server and decrypt my files there. I had already encrypted the repo beforehand with `git-crypt add-gpg-user` and it works fine on my development machine, but nothing I'm doing seems to re-unlock the repo on the production server. Specifically, I get the error

`Error: no GPG secret key available to unlock this repository.`

I attempted to make a new GPG key on the production server, but that didn't help. I also don't know if my development machine has a GPG key linked to `git-crypt add-gpg-user`, meaning I don't have a key to export. I apologize if this seems like a trivial problem -- this is my first time using GPG and I have no idea what's going on. Can someone give me some guidance?