T480 thinks its from IBM and wont allow Windows to be setup

Got this laptop back from out of warranty repair depot, finally get around to installing windows 10 on it and greeted with this.


Completely standard windows install but seems to be somehow set to only allow @IBM email accounts to login. Been basically ignored by the repair depot for past couple weeks and Lenovo support was just as confused as me (and also refused to help) so wondering if anyone has any idea how to fix this.

is there anything you could do in bios?, like disable secure boot etc to see if it would fix your problem. how about installing windows 7 on it?.