Zkteco Authentication Failure Solution Best -

Ask the user to rub their finger against their forehead or nose to pick up natural oils before scanning. For a permanent fix, re-enroll the user using a different finger or switch them to an RFID card/PIN code. 3. Resolve Data Synchronization Issues

Sometimes the device authenticates the finger perfectly, but the server rejects the user due to a communication error disguised as "Authentication Failure." zkteco authentication failure solution best