I don't have the 16 characters, but the thing, I'm still using the same phone. It's just that I'm running iOS 15.8 and the phone wants me to update the app. Should I just go ahead and update and see if the codes are still there?
You mean the 2FA app? You can if you want.
Yes, the Google Authenticator 2FA app.
From what I gather, the logo has changed and the phone wants me to update the app, but it's still the same old phone and the app is the same.