Question added by Joe Tannorella

Examples of good two-factor authentication UX/UI where 2FA isn't mandatory?

By "nice", I really mean a flow that isn't too obtrusive, and while not being mandatory, is still exposed to the user prominently. Some companies are too prominent with this, while others offer it but don't make that clear. I'd like to see examples of good and bad so that they can be compared.

1 answer
Joe Tannorella answered on 21 Sep 2018

Google do this really well, take a look here:

https://www.google.com/landing/2step/

One thing I really like about Google's 2FA flow is that when signing in from a new device, they offer your primary 2FA method (e.g. one-time code from Google app, Authy app, etc.) and if that method isn't available to you currently, you can switch to use SMS for a one-time code instead.

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