system
A chat on subreddit /r/pcmasterrace
human
Idk how ibuypower works but if they work like an oem usually oem systems and prebuilts come with a version of windows that can’t be transferred if you don’t have a physical cd key. Doesn’t hurt to try but op may need to buy a key if the registration doesn’t transfer. Or do the call method and hope someone is nice.
gpt
If you log in with your windows account it ties to that and your mobo. You can deactivate the copy on a system from your Microsoft account and apply it to another system you're  logged into (iirc from when I had to do it a while back)