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Duo does not require this at all. And Authy only requires you to store their "Authy" token. You can add additional, e.g. Github, tokens to Authy and choose not to sync them with the Authy servers. That's what I do.

Authy requires your mobile phone number and the creation of an account to work at all … or am I missing something? I haven't found a way to use Authy without providing my mobile phone number and creating an account.

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