Google unveiled the Pixel 4 signature features months ahead of the phone’s launch, confirming rumors that said the phone will be Google’s first handset to support 3D face recognition. At the time, Google also announced that its face unlock system would use a novel approach, relying on Soli radar chips to enhance the functionality, and suggested that its Face ID alternative might be better than alternatives. Once the Pixel 4 was launched, users discovered that face unlock had one critical flaw when compared to Apple’s, as it didn’t have a Require Attention option — that someone could unlock your phone by holding it against your face while you sleep. That’s the kind of security oversight that can be fixed via a software update. But it turns out that software updates can have negative effects on face unlocks, as some users haven’t been able to use the feature to unlock their handsets.
The feature isn’t widespread, Android Police reports, but there have been plenty of reports online since November detailing the issue. Some Pixel 4 owners observed two distinct errors when attempting to unlock the phones, considering the prompts they received — Can’t verify face. Hardware not available and Can’t verify face. Try again.
Many of them first experienced the problem after installing the December security update, although it’s not clear what causes the issue.
read more at https://bgr.com/2020/01/10/pixel-4-face-unlock-not-working-authentication-failure-and-fixes/
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