There's something important about 2FA code, most of users do not know they need to keep the secret code saved to restore 2FA. If you haven't done it, you better change the 2FA binding and keep the secret key safe.
when you are activating the 2FA it shows you a QR code and a secret code, before scanning the QR code with Google Autenticator, take a photo of the code or write it down, then scan it.