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This is great forward progress, I much prefer U2F where available. I hadn't even realized that FB supported 2fa, so I just tried to set it up on my iPhone, and either automatically or manually cannot get a test code to work. This tends to reduce my confidence in any other aspect of their implementation

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counter-anecdote: I've had zero issues with FB 2FA and I'm pretty sure many, if not all (I would hope it's an internal policy, but idk...) FB employees have it enabled, so it'd be pretty difficult for them to not notice serious issues with the use of their implementation (as your post suggests exist).

The 2FA code generation has always worked perfectly for me for the past year (or two?) that I've had it enabled

I have to admit to being quite startled. But I just get "Security code was invalid. Please try again". I've tried again several times. I'll see if setting it up on the website works.

FWIW I could successfully configure 2fa on the desktop, which works fine on mobile,

Cool, glad it worked

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