How to Set Up a Hardware Key Protector on Your Apple Account

You no longer do the six digit code. It's replaced by please insert your key into a device to authenticate. However you need to have two because there is a minimum requirement of two hardware keys on an account before this will work. Only downside is these are not particularly cheap. The UB key 5CI has got lightning and USB on it and it's 72 pounds on a well-known shopping site. That's not cheap especially as you need a minimum of two of them.