A Mac device with Symantec Endpoint Protection Cloud (SEPC) client installed is displaying a lock icon and requesting a 6 digit pin.
Mac won't accept password after portal lock command, and requires a six digit password to unlock.
Mac OS device with MDM enabled
SEPC clients for Mac have an anti-theft feature that allows administrators to lock the devices if they go missing or are stolen. When an administrator engages the lock function from the SEPC portal, the device will reboot to a password-protected screen. A pin will now be required to login to the MacOS system.