Unable to log in windows 10 using fingerprint reader
If you are unable to log in into Windows 10 because your fingerprint reader does not react to your finger swipe and the fingerprint activity led doesn't lit or Windows 10 shows only your password input field just click on the switch off icon and check if there are pending updates that Windows hasn't already installed. It will show "Update and restart" or "Update and shut down" options. If you have unsaved work do not restart or power off your computer, log in using the password field and save everything first.
Possible cause could be a temporary login issue or a failed windows update but you can use the Windows Hello login feature using your fingerprint after you rebooted your system.
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