Update

iPhone X Face ID fail: A feature, not a bug

That's what it was supposed to do, Apple says.

Update 3:15 p.m. ET: Craig Federighi responded to a customer email about Face ID and confirmed that it works with sunglasses.

When the moment of truth arrived at the Apple event on Tuesday, iPhone X failed. During the world premier of the device’s lauded Face ID biometric security system, it took Craig Federighi three times to get face ID to unlock his demo phone. But don’t worry, Apple says. That’s supposed to happen.

When Federighi began the iPhone X demo, he naturally started with a locked iPhone. “Unlocking it is as easy as looking at it and swiping up,” he said, hoping to magically unlock the phone to whoops and cheers from the audience like when Steve Jobs swiped to unlock the original iPhone. Except that didn’t happen.

On the first attempt, the phone didn’t respond. The second try produced the pin code screen with the message, “Your passcode is required to enable Face ID.” It wasn’t until the third attempt—after Federighi had to pick up a backup iPhone X and wipe some sweat from his brow—when the iPhone X finally unlocked.

[ Further reading: iPhone X event recap: Everything Apple announced at its first Apple Park event ]

Naturally, this blooper went viral on social media, as people began to question the accuracy of Apple’s new unlocking method. Well, apparently Apple has had enough of the ribbing, since it has responded with the following statement, as first reported by Yahoo’s David Pogue:

“People were handling the device for the stage demo ahead of time and didn’t realize Face ID was trying to authenticate their face. After failing a number of times, because they weren’t Craig [Federighi], the iPhone did what it was designed to do, which was to require his passcode.”

OK, we can buy that.

Apple also wants to alleviate our concerns about how Face ID will work when it’s not on a giant stage. In an email reply to concerned customer Keith Krimbel, Federighi assured him that Face ID will be able to work when using dark sunglasses: “Most sunglasses let through enough IR light that Face ID can see your eyes even when the glasses appear to be opaque. It’s really amazing!”

Federighi also confirmed that Face ID will not unlock the phone if a user isn’t staring directly at the screen and shared this tidbit: “If you grip the buttons on both sides of the phone when [you] hand it over, it will temporarily disable Face ID.”

But the question remains whether Face ID will be as fast and foolproof as Apple claims. In our hands-on demo of the new feature, there were some quirks, but Apple still has some time to iron out the bugs before iPhone X starts shipping.

Face the music: Apple may have a tidy explanation for what happened here, but the damage is already done, and many people have already seen the headline, “FACE ID FAIL.” Granted, it’s unlikely to impact sales of the new $999 device too much, but still, Face ID is going to be a heavily scrutinized and criticized feature in the new iPhone X, so much so that Apple might regret not putting a fingerprint scanner on the back of the device. But hey, these things happen. It’s not like Steve didn’t have his share of keynote mishaps.

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