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Re:Warning: Google Authenticator upgrade loses all accounts by PLejeck on Wednesday September 04, 2013 @02:01AM (#6325865)
This is not at all true. Both are generating your tokens clientside with no internet connection. Try disabling internet access, it should work.

As for the mobile number, I didn't have to type that into Duo Mobile when I installed?

Re:Warning: Google Authenticator upgrade loses all accounts by nwh on Wednesday September 04, 2013 @02:10AM (#6325893)
You certainly do for Authy, I was apparently wrong about Duo.

http://i.imgur.com/dY1zWUe.png