I wanted to secure my administrator account login to the backend of Joomla. Joomla 4 comes, by default, with Web Authentication Plugin enabled. So I looked into how to enable it. The following Joomla Article was very helpful:
WebAuthn Passwordless Login - Joomla! Documentation
I am using Windows 11 Hello, so when I added the W3C Web Authentication (WebAuthn) Login to my user account, it simply asked me to verify it was me with either my pin or face.
Save & Close the User Account change and Logged out of account from backend.
When I logged in again, it asked for pin number. Other options button provided the face recognition option, which worked perfectly. The next day, it used my face automatically. I'm assuming that when my computer reboots, the module uses something from Windows to determine my Hello preferences.