Coolpad India — fingerprint option missing in setting suddenly

Address: New Delhi, Delhi, 110085

Hi i have purchased coolpi3600 7 months ago through amazon or flipkart not sure. That is not a concern though.
Today 14th feb 2018 my screenlock option through fingerprints suddenly diassapeared from settings. I have been using screenlock and for any app i was used to unlock the app and screen thorugh fingerprint password.
But suddenly don't know what happened all vanishes out. I tried to reconfigure the fingerprint password but don't see any option there in security and logons under settings which was there before today.
Kindly help. I have tried factory rest and still its not working.

Manoj singh