I have a sibling who's "no fixed abode". Teaching him how to use 2fa isn't the problem. It's that all property is transient, so the 2nd-factor can't be tied t

I have a sibling who's "no fixed abode". Teaching him how to use 2fa isn't the problem. It's that all property is transient, so the 2nd-factor can't be tied to property. It doesn't matter if that's his phone or his socks. "Something you know and something you have" does not account for those who have nothing.