Why do I get a ‘Remote Management’ step when installing High Sierra? I got a 2015 MacBook Pro from eBay. I’m trying to install Sierra from scratch (after completely formatting the SSD) but I get this strange extra step (although the install USB is vanilla and done using Apple’s own bootable usb tool) that I can’t pass (pressing continue asks me to connect to a IBM private network, which I obviously can’t do)

Does anyone have any info about this. Where is this MacBook comming from? How can I disable this remote management step? Is this a custom firmwere, or where does this come from?
This Mac has been enrolled under Device Enrollment. Upon connecting to Apple, the device has received instructions to be managed by IBM.

This cannot be bypassed. You should contact the seller.

Mobile Device Management ‘locks’ enforced by Device Enrollment are enforced by Apple’s severs and are based on hardware identification, so cannot be removed by macOS reinstallation ― they’re defined to be enforced as soon as the Mac is unboxed for the very first time prior to any manual configuration.

About Device Enrollment