I scanned the QR code into second driver’s app/account. It added driver profile to screen in car but removed the vehicle from my app/account and add it to second driver as you say. Lexus send an email telling you that connected services have been removed from your profile. So I then removed the vehicle from second driver’s app/account, readded it to mine and replied to Lexus mail to confirm. Seams to have worked and now have secondary driver profile in the car.