Members should control which devices can sign in.
Place the widget
Add Passkey Settings on a members-only or account page. Unsigned visitors cannot enroll.
Add a passkey
The member clicks Add passkey, confirms with Face ID, fingerprint, PIN, or a security key, and the credential is stored for that site.
Rename and revoke
Use Rename so the list stays readable (for example “Laptop” vs “Phone”). Revoke or Remove stops that passkey from working. Other sign-in methods still work.
Safety
Keep email/password or social login available so a lost device is not a lockout.