How do I find my recovery code

Recovery code or Recovery Key?

If Recovery Key, from the article below.

What if I lose my Recovery Key?

You can sign in to your Apple ID account page and create a new Recovery Key using your Apple ID password and one of your trusted devices.

Apple ID - Two Step Verifications FAQ

Well that depends.

If it’s an Apple account I would look over this article to help.

Recover your Apple ID

Hope that helps.