You can log in to your app account using Face ID/Touch ID on devices that support this feature. Upon logging into your account on a Face/Touch ID-capable device, the app will ask if you wish to save your login details with Touch ID to log in faster. You may hit OK or Cancel to save your details or dismiss the message.
Please note that if you log out of your account manually, Face/Touch ID will not be enabled on next login. This is because Face ID and Touch ID require us to securely store the user’s credentials so that we can automatically fill them when they authenticate. We remove these credentials when a user explicitly logs out as they’ve expressed an intent to no longer be logged in to their account on this device.