Iphone 6s plus 3rd party lightning cable
I recently purchased two iPhone 6s plus(for myself and my wife) and a 3rd party lighting cable(3m). When I attached my phone to the 3rd party lightning cable to sync to my mac it worked perfectly(charging and syncing). Unfortunately the same cannot be said for my wife's iPhone, because when attached to the same cable and mac the following message appears on her screen"This cable or accessory is not certified and may not work reliably with this iPhone". I understand that it could be caused by the 3rd party cable, usually, but the fact that its working on one iPhone 6s plus and not the other has me dumbfounded. Would appreciate it if anyone can chime in with a why this may be?
Thank you Kindly.
iPhone 6s Plus, iOS 9.1