Passkeys don't work

Phone passkeys (QR code flow of fido) doesn't work. I can scan the QR code but the two devices never connect. You can use this website to test: https://www.passkeys.io/

Start by reproducing the QR-code passkey flow on https://www.passkeys.io/ with a phone and another device, recording the browser and device details. No repository file or test is named, so the next step is to locate the Chrome passkey/FIDO code involved and define done as successful connection and authentication across the two devices.

Written by the indexing model from the issue text.