Until you get a new phone and codes don't sync and backup codes don't work.
Re:Factors in authentication
by munchbunny on Tuesday January 15, 2019 @11:14PM
(#18918184)
Responding to your shameless plug, I work on this stuff (auth and enrollment for the security token), would love to chat if you have time!
Especially that not all authentication factor are equal and the mobile phones are getting it right is on point.
(shameless plug, i'm the CEO, as ubiqu we have build al the tooling necessary to use your phone as a authentication and signing device across all digital channels)
TL/DR: phone as an authentication device is a good idea.