Every sign-in screen offers a "Use my Smartphone" option alongside the regular passkey prompt — for a computer that doesn't have its own fingerprint reader or security key, or one you're using for the first time.
How it works
- On the sign-in screen, choose Use my Smartphone.
- A QR code appears on the computer's screen.
- Scan it with your smartphone's camera. This opens a page on your smartphone, not the computer — your smartphone is where the actual passkey check happens.
- Complete the check on your smartphone exactly as you would signing in there directly (fingerprint, face, or security key).
- The computer signs you in automatically the moment your smartphone confirms it — no code to type back, no separate confirmation step on the computer.
The QR code refreshes periodically while you wait, so it doesn't go stale if you take a moment to find your smartphone.
This doesn't register a new passkey on the computer — it just borrows your
smartphone's passkey for that one sign-in. If you'll be using a particular
computer regularly, you can still register it with its own passkey separately;
the QR option is there for whenever that's not worth doing, like a one-off
shared machine.