On the Samsung Galaxy s21 Ultra In the setting on my phone I turned off the always on fingerprint so I have to wake the screen with the power button before I actually press the fingerprint sensor. The issue is(and it’s a small one but still is annoying) it throws the error that your thumb isn’t covering the whole sensor or the error to press harder before you even touch the sensor. And it’s annoying to see that every time the screen is turned on. My guess is it is reading (or attempting to read) the finger when the power button is pressed even if the finger isn’t there instead of waiting for you to actually touch it. Should be a simple software fix.
Thank you for participating in the Samsung Developer Forum. However, this is not the correct forum for product bug reports, questions or concerns.
I would recommend you post at https://www.samsung.com → Click on Explore Tab → Click on Community.
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