Why has Windows 10 fingerprint stopped working?
The main cause behind the Windows fingerprint scanning not working is a problematic driver. A possible solution for the Windows Hello fingerprint not available issue is to update your drivers. You can also try to use another fingerprint reader to secure your device.
Why has my fingerprint login stopped working?
In case your Android fingerprint is still not working, you might need to clear your phone system cache. Normally, this doesn't do any harm to your phone; it just clears the stored frequently accessed data by apps and the system. And you should do it often after every system update.
Why can't I use my fingerprint to unlock my laptop?
Your fingerprint reader's status might be locked if an app is currently using it. This might happen if the app is being updated or is using the fingerprint reader for a specific task. To unlock the fingerprint reader, close the app that's using it.