So, what do people use for 2FA code generation?. Google Authenticator appears dead and can't migrate devices. Authy had that account recovery bug, and twitter makes me either give them a phone number or a 2FA app before I can use a u2f token.
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Switched to FreeOTP on iOS awhile ago, from Google Authenticator. Don’t find myself using TOTP much these days though.
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What I want is a global backup code I can write down on a piece of paper for when I lose my phone. Anyone offer that?
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I'm not aware of a TOTP implementation providing it.
However, that's how U2F / FIDO2 is implemented by hardware wallets. It's based on the seed phrase, so you can restore your U2F / FIDO2 key on another hardware wallet with the recorded seed phrase.