https://wccftech.com/google-pixel-2-bootloaders-unlocking/

Most of the software issues on the Pixel 2 and Pixel 2 XL are finally phasing out as Google comes into action and starts rolling out updates for fixing them. The latest issue that has got treated is the unlocking of bootloaders, recently many Pixel 2 users complained about the issue on Pixel Product Forums to bring it under notice. Today, Google announced that the problem has been fixed, but Pixel 2 users still need to factory reset their devices to unlock the bootloader.

For those who don’t know, the bootloader on Android devices needs to be unlocked by going to the Settings and enable the ability to unlock the bootloader. Without doing this, the bootloader remains locked down. On Pixel 2, many users were frustrated to see that bootloader on the device cannot be unlocked. Many of the Pixel 2 units sold by Google Store arrived with bootloader option disabled.