J320W8 Unlock Error, Help Pls

I unlocked few of the same phones with no problem but this one just won't unlock. What could be the problem and how to unlock please?

Platform: Samsung Android
Selected port: COM1
Selected model: SM-J320W8
Searching for a phone. Please wait...
Found phone on COM47
Reading info...
Detected phone model:
HW Version: SM-J320WZAAXAC
PDA version: J320W8VLS2APJ1
CSC version: J320W8OYA2APJ1
CP version: J320W8VLS2APJ1
Phone SN: R28HA0G4HDW
Phone IMEI: 358998-07-147380-8
Unlocking phone...
error code 0
Phone unlocking failed
Performed by 2.4.2 Software version.
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