@jimmy_uk
iPhone 7 time bomb finally went off. Major bummer. It’s happened to lots of people.
There’s another thread here on MR describing your exact same nightmare with Two Factor Authentication when the primary phone is inop. It’s a REALLY bad system that was never thought through- as you experienced.
Anyone with sense should turn THAT nightmare-in-the-making off.
I assume you’ve got a backup of your iPhone 7 data, so now it’s just a matter of waiting to get a replacement phone to copy it to.
I’m a STALWART proponent of everyone having a backup fully functional older iPhone for situations exactly like this. An older phone for a backup is cheap and the insurance it provides when a disaster like this occurs is priceless.