OEM verification code / unlock bootloader

As I just got a new F3+ I am trying to in stall /e/ os in F3+, in Developer Option I have been trying to unlock the OEM which call for a code.
After getting the IMEI (slot 1) number and the Serial number, went to get the code at FP3 'verify code' generator and Bootloader Unlocking Code for Fairphone 3 - Fairphone
One after another none of these codes worked, each time at the bottom of the screen a small message pops up “Inner Unknown failure” while the another message says “Processing”

With ADB adb reboot bootloader the phone screen menu says “DEVICE STATE - locked”
Got the latest F3+ buitd 3.A.0054. and thoroughly imput the IMEI (slot 1) and the SN without typo.
Fastboot oem unlock command does not work either.
Did a factory reset still doesn’t work !
Please help!

A post was merged into an existing topic: Bootloader Unlocking Code for Fairphone 3 not working
as there’s a solution mentioned and to avoid duplicate topics.