Recovery key
How to get recovery key of icloud that is not setup on device.
I entered my apple id but i don’t remember my recovery key how can i get recovery key ?
You either have to remember the Recovery Key or you can try generating a new on.
From the Related Article above.
With that in mind, it's important to keep your recovery key in a safe place. You might want to give a copy of your recovery key to a family member, or keep copies in more than one place. That way you always have your recovery key when you need it.