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Does anyone know if iOS devices support multiple users/bio metrics per device and could log a specific user in when they are using a shared device? I'm wondering if this could be used for a shared iPad on a factory floor to log users into their own account on our web app.

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Since we are really talking about WebAuthn and not just the iOS implementation, You probably could use alternative hardware (maybe android based) that supports the multiple-user biometric use-case. From the server/web-app side it still would just be WebAuthn.

Looks like you use a separate device like this: https://www.ftsafe.com/Products/FIDO/Bio

That supports fido2, hooked to any tablet to make it work.

It's not really supported for Face ID - you can create an "alternate appearance" for Face ID but it doesn't work well if the people look very different. With TouchID you can register fingers from different people and it works fairly well, but again not really supported.

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