Hi, @tiger
Yes, a valid Windows 11 Pro key can upgrade the PC from Home to Pro and activate Pro. However, Microsoft recommends activating Windows 11 Home first before doing a manual Home-to-Pro upgrade. Reference: https://support.microsoft.com/windows/deployment/install-upgrade/upgrade-windows-home-to-windows-pro
Before you try it, I would check a couple of things:
- Where did you get the Windows 11 Pro key: Microsoft, a retailer, or another PC?
- Under Settings > System > Activation, what activation error or message do you currently see?
- Did this PC originally come with Windows 11 Home preinstalled?
Click "Add comment" to let me know.
Thanks!