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Re: [webauthn] webauthn - API need to know the registration status of an platform authenticator (#1639)

From: Manish Khedawat via GitHub <sysbot+gh@w3.org>
Date: Tue, 06 Jul 2021 16:38:33 +0000
To: public-webauthn@w3.org
Message-ID: <issue_comment.created-874914061-1625589511-sysbot+gh@w3.org>
Awesome. Looks like autocomplete will sort things out.

> If you know who the user is, then you have state (e.g. cookies). If you have such state then you can record whether the user signed in with WebAuthn initially. If so, then you should request an assertion and pass all the credential IDs for that user. It's possible that they deleted the applicable credential since signing in, but that seems like a very narrow case.

On a general day, Yes a narrow case. But during the OS upgrade season, it is not.  In our recent Big Sur migration, we saw many examples where the platform authenticator broke but cookies were intact. I hope that also gets stable over time.

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