Any updates on this? Last time I checked cross-device flow was unfortunately giving different result than same device flow.

MacOS / Safari: 15.3.2 / 18.3.1 iOS: 18.3.2 Mac was the device initiating the WebAuthn PRF call. iPhone was the device scanning the QR code, executing the PRF call, and reporting back to the Mac. PRF result is different than running the whole flow just on MAC, when using the same Passkey entry.