activation lock on and do not know previous owner

yale212 wrote:

Any way to turn off activation lock on a MacBook pro year 2018 and not know the previous owner?

Then you have bought a brick. I would return it...

If the Apple ID associated with the machine is locked or disabled

ref: If your Apple ID is locked or disabled - Apple Support

To be in your control a used Mac requires it is prepared properly for resale:

What to do before you sell, give away, or trade in your Mac