Fingerprint Sensor problem On Your Smartphone
Firstly, clean your hands, because there may be a problem due to dust or debris on the fingers.
Clean the fingerprint scanner with a soft cloth, and then check that your problem may be solved.
Remove the saved fingerprint from your phone, and add a new fingerprint again.
If the above measures are not working, then factory reset the phone can solve this problem.
Here I have covered all the issues and problems regarding smartphone and try to fix them.
If you still have any other problems with your smartphone then leave a comment below.