Cant unlock bootloader, asus max plus

ZF Model: ZB570TL
RAM: 4G
Firmware/APP Version: Android 8.1
Frequency of Occurrence: All the time
Rooted: no
APP Name: ASUS Unlocker Tool
I cant unlock my phone's bootloader.I have unlocked my bootloader before, I tried installing custom roms but something went wrong and I flashed the stock firmware.
After I flashed the stock firmware, everything seems to be fine but then when I try to unlock again, it doesnt work and gives me this error:
An unknown error occurs, which may be a network connection issue. Please try again later.
i need to unlock this phone for school
please help
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Comments
@swhy921
I'm apologetic that the ZB570TL will no longer have any maintenance.
Sorry for any inconvenience it may cause.