The process works. I once got a MacBook issued from work that didn't have DEP or any MDM, so I did enroll it in Find My / Activation Lock. When I returned it I

The process works. I once got a MacBook issued from work that didn't have DEP or any MDM, so I did enroll it in Find My / Activation Lock. When I returned it I thought I had removed the lock, but there's a bit of a misleading option to remove a device (until it checks in again) from Find My that doesn't disable the lock. So work tried to contact me through a colleague, failed, and when I called back they already had the Apple reseller do it for them.