MOto X2 Need help

Hi
I need help about this MotoX2

The phone comes with no startup problem.
I flashed and now turn on
but now
ask me to need google account but the customer forget it

I try to unlock bootloader to downgrade but the ¨Enable OEM unlock¨ in developer menu is not tilt.

C:\SDK\sdk\platform-tools>fastboot oem unlock Kxxxxxxxxxxxxxxxxxxx
...
(bootloader) Check 'Enable OEM Unlock' in Developer Options.
FAILED (remote failure)
finished. total time: 0.016s

Anyone can help me please ?

Many thanks

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MOto X2 Need help