remote: oem unlock is not allowed i did not find any solution on xda-developers, so i am posting this question here.
i am trying unlock bootloader on nokia6 when i give command:

sudo fastboot oem unlock


or 

sudo  fastboot flashing unlock


always i am getting error:

...
FAILED (remote: oem unlock is not allowed)
finished. total time: 0.002s


phone model: Nokia6(T1021)

android version: 8.0.0

usb debuging and oem unlocking is on

Does Nokia not accept unlocking bootloader?
As far as I am aware of, the Nokia Android phones by HMD Global does not allow unlocking bootloader. I have also stated the same in another answer.

So you're out of luck, at least for the time being.

Reference: XDA Developers