Over months, fingerprints change slightly due to skin wear or cuts. The original template becomes obsolete.
The most common cause of authentication failure is a mismatch between the credential being presented and how the user is registered in the system. zkteco authentication failure solution best
: Gently wipe the optical sensor with a soft, lint-free cloth. Avoid abrasive materials or harsh chemicals that can damage the scanner. Over months, fingerprints change slightly due to skin