The biometrics don't authenticate you to the remote service. They authenticate you to the device that has the keys that authenticate you to the remote service.

The biometrics don't authenticate you to the remote service. They authenticate you to the device that has the keys that authenticate you to the remote service. Biometrics are a convenient replacement for a screen lock pattern/PIN, but not a necessary one, of course. https://www.wired.com/story/fido-alliance-ios-android-password-replacement/ https://www.wired.com/story/fido-alliance-ios-android-passwo... is a good explainer.