Sign in with the same account you use in the LS Duet mobile app.
Open the LS Duet mobile app and tap "QR on another device" to get a 6-digit code.
WhatsApp is generating the link — this usually takes 10–20 seconds.
In WhatsApp: Settings > Linked Devices > Link a Device.
The QR refreshes automatically every 20 seconds.
Your phone is now connected. You can close this window — the mobile app will pick it up automatically.