Win 8 Core on a tablet won't accept company provided KMS or MAK key to upgrade to Pro
Windows 8 Pro - Windows 8 Professional MAK-- Error: 0xC004F069 On a computer running Microsoft Windows non-core edition, run 'slui.exe 0x2a 0xC004F069' to display the error text. (which is: "The Software Licensing Service reported that the product SKU is not found.")
Windows 8 Pro - Windows 8 Professional KMS -- Error: 0xC004F050 The Software Licensing Service reported that the product key is invalid
Any advice?