A very annoying feature of S10 Lite is that its fingerprint scanner just refuses to work under sun. I wonder why samsung technical team is not able to fix this niggle since long.
I have the S10 lite, but I have never had a problem with the fingerprint scanner, nor the problem you are facing. try to re-register your finger, maybe press a little bit harder on the screen/scanner, so the sunlight won´t affect the readings.
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