Why isn't my fingerprint being recognized anymore?

[AC Question]

why my fingerprint to open my cellphone is not recognized anymore?

it keep asking my backup password which i don't set it I only have my left thumb for a back up since I'm using my right thumb .

 

[belodion]

Re: why my fingerprint to open my cellphone is not recognized anymore?

Welcome.

The possible failure of the fingerprint scanner is one reason that the user is required to set a backup PIN or password.