It's designed to be a second layer of protection, thats why they give you backup codes when you scan the barcode so if you lose or cant get to your phone/device you still have those codes to login with.
I've just added a new device at Nominet and turns out they are probably the only service ive known NOT to give backup keys as well lolI don't remember getting back up codes :/
Where was they shown ?
It's been covered elsewhere on the forum, but don't forget you can also use Authy on Chrome if you want to have a second parallel way to activate/access 2FA as well as your mobile phone.
https://chrome.google.com/webstore/detail/authy/gaedmjdfmmahhbjefcbgaolhhanlaolb?hl=en
(Of course that doesn't help if you can't log in, but it may help in future.)
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