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Was it connected to a domain at a time previously?
Normally, when you use the device, you are logged in under your user account, which is an admin account. This means you should be able to complete the reset by using the account you normally use just to log into Windows.
If you haven't been able to log in at all, that's a little more difficult, since someone else has their account protecting the operating system. And without being able to rest your (their) password, you won't be able to reset it the typical way.
You an try using a password ***** program from a third party like password *****
If that doesn't work, you should be able to install a fresh copy of Windows from USB. Not the ideal situation, but a fallback if you need it.
You should be able to do it with a downloaded recovery image:
If you recover from an external drive, it will format the drive on the surface.
This is not good. That means that it belongs to an Enterprise customer and the person who sold it to you is not the rightful owner. I would either contact the seller or contact the company to whom it belongs if you can figure that out from the domain.
Unfortunately, I think that may be the case. It may be something you should report to the police in case it is stolen. Just to CYA.