you need to provide more context, is this a brand new laptop that is updated from 8 to 10, or an old laptop you're updating
no, a desktop. bought/came with oem 8.1 several years ago. we bought win10 to do a fresh install on another desktop a few months ago. installed it and entered the product key. now
this machine, the one with 8.1 oem, I just installed that same copy of win10(usb) and when finished checked system information and it says it's activated. never even asked me for a key
I think it's because it came with 8.1 oem so windows doesn't give a shyt about a fresh 10 install. it just activates automatically
I was just concerned that it automatically transfered the license over to the 2nd machine and deactivated the other one. but I checked the key in command prompt and it's a completely different 5-digit group from anything on the win10 key, so i'm guessing it's part of the 8.1 oem key