If you encounter the "failed to verify" error message while punching in the attendance machine, it typically indicates that the user is either not registered on the machine or the machine's attendance storage capacity is full.
If the user is not registered in the Biometric machine, please register the same.
If the issue is due to the machine's attendance storage being full, you can resolve it by following these steps:
1. Open device Menu and go to Data Manage -> Delete Data.
2. Select Delete attendance data to clear all stored attendance records from the machine.
3. After deleting the attendance data, the user can attempt to punch in again. The machine should now have sufficient storage capacity to accept new attendance records.
For detail you may refer this article for clearing attendance data from device.