When setting up a new passkey, we recommend keeping your old device nearby. With Bluetooth enabled on both devices, scan the QR code from your old device to authorize and complete the setup.3. I updated to iOS 18 but can't create a passkey. What should I do? If you're unable to create or use a passkey after upgrading to iOS 18, it's possible that the built-in Passwords app on your Apple device was deleted or is not functioning properly.