[granos]

They do. In fact, I just logged in to change my password and had to go get my phone from another room so I could read the code. The annoying thing is that they don't support Google Authenticator or some other TOTP/HOTP token generator. It sucks trying to log into services that use SMS based 2FA when you are not in an are where you get cell reception.

[cdnsteve]

App based 2FA seems extremely limiting. I don't want to install their app on my phone.

[nashashmi]

Doesn't have to be just their app. There are plenty of apps and chrome extensions that mimic authenticator ability.