SYNC with multiple devices

Does SYNC have a bug where ios is concerned? I am unable to setup sync to multiple mobile devices, e.g. iPhone & iPad.
I open SYNC in the desktop browser > add new device > choose mobile and get a QR code.
I got to SYNC on the iPad > but it doesn’t open the camera to image the QR code on the desktop.
I reverse the process and have the same issue.
I have been able to sync the desktop to iPhone.