The Nokia 6.1 (2018) (PL2) ‘TA-1043’ is optically an attractive Android One phone, but has a serious disadvantage in practice: the bootloader isn’t officially unlocked by Nokia (currently only on the Nokia 8). I stay away from dubious unlocking scenarios with costs.
Without OEM-Unlock the CustomROM e-0.12-q-20201008 or LOS 17.1 cannot be installed.
Warning | Important: An official method of unlocking the bootloader is not available, but there may be some unofficial methods available. Unofficial methods are not recommended or supported by LineageOS, so use them at your own risk! An unlocked bootloader is required to install LineageOS.