iOS 15.4 won't unlock an iPhone X, XS, or 11 using Face ID if you're maskedWhat you need to know
Apple has released iOS 15.4 to developers and it brings the ability to use Face ID even when masked.
Testing shows older iPhones don't support the change in Face ID functionality.
It's likely the problem is related to the increased processing power required by the change.
Apple hasn't said why this might be, but it's likely a processing power situation.
While the first beta release of iOS 15.4 does include support for unlocking an iPhone while wearing a mask and using Face ID, it seems that feature isn't available to everyone. According to tests, iPhone X, iPhone XS, and iPhone 11 devices do not support unlocking using Face ID while wearing a mask.
In tests conducted by MacRumors it was confirmed that iPhone 12 and newer devices work fine. I haven't seen confirmation on whether iPhone XR devices will work, but given their aging A12 Bionic processor, it seems unlikely.
Based on our testing, the "Use Face ID with a Mask" feature is available on the iPhon...
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iOS 15.4 won't unlock an iPhone X, XS, or 11 using Face ID if you're masked
