Ultrasonic fingerprint scanners can have problems with some screen protectors, as they may register the sound of a “fingerprint” which is bounced back off the screen protector rather than the actual fingerprint’s ridges.
In short, the phone has “registered” a fingerprint which may look like any finger pressing through the screen protector.
In other words – a fingerprint was not reliably registered in the first place.
https://www.grahamcluley.com/about-that-any-fingerprint-can-unlock-your-samsung-galaxy-s10-report/
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