Unlock MacOs with fingertips doesn't work on Big Sur I'm trying to unlock my Mac with Touch ID. During the initialisation process, I configured my fingertip correctly but when I try to unlock my Mac it doesn't detect it.
If I go in &quot;System Preferences&quot; under the menu &quot;Touch ID&quot; this is what I see:

Then I decided to check the &quot;Unlocking your Mac&quot; option, I fill the password but if I open &quot;Touch ID&quot; for the second time &quot;Unlocking your Mac&quot; is still unchecked.
Why? What can I do?
This has recently happened to my sister's Macbook Air 2019. The solution for me was resetting the SMC. To do so in a T2 equipped Mac device:

Shutdown your Macbook.
Press and hold the power button for 10 seconds.
Wait a few seconds and power on your macbook again.

Reference: https://support.apple.com/en-ca/HT201295