Personally: 1. I use Authy with cloud sync disabled for 2fa codes. When I upgrade iphone/restore from backup all codes are there (worked for the past 8y or so,

Personally: 1. I use Authy with cloud sync disabled for 2fa codes. When I upgrade iphone/restore from backup all codes are there (worked for the past 8y or so, I upgrade iphone every year). 2. I never leave old iphone until I tested most important things on new iphone like email, bank, github, etc. Hope this helps for future, sorry this is too late.