https://www.theguardian.com/technology/2017/sep/14/apple-face-id-didnt-fail-at-iphone-x-launch-staff

Company says too many people tried to use Face ID on device backstage before its unveiling, highlighting a potential problem for prospective buyers

Apple has offered an explanation for an embarrassing glitch at the launch of its most expensive iPhone ever, arguing that the phone didn’t make an error – the company’s staff did.