Sign count is always zero

[maricavor]

Why after verification sign count is not updating and always zero:

webauthn_credential.verify(
        session[:webauthn_challenge],
        public_key: credential.public_key,
        sign_count: credential.sign_count,
        user_verification: true
      )

      credential.update!(sign_count: webauthn_credential.sign_count)

It looks like authenticator does not support a signature counter according to this: https://www.w3.org/TR/webauthn/#signature-counter. I am using macbook pro and chrome browser, where to know which authenticators support signature counters?

[bdewater]

This is normal and in some cases (eg passkeys synced to the cloud) even expected. In my experience USB security keys do have counters.