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If I have an account, say with google, and only use that account from location A, using device A, and another google account only used with device B in location B, if I used the same 2fa FIDO key for both accounts, would google have any way of knowing the same key is being used for both accounts?

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  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking.
    – Community Bot
    Jul 16, 2022 at 18:25
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    Google doesn’t allow you to tell them what authenticator you will be using, they generate a secret code and a QR code, so your example isn’t possible. Most websites are the same way.
    – Ramhound
    Jul 16, 2022 at 19:58

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A website has no way of knowing where the certificate that was used is physically located on the user's computer, meaning from which device it was read.

The answer is No.

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