Hello, Owen Joy
Welcome to the Microsoft community.
Thank you for your feedback. Based on your current situation, if you don't want to be sure and did purchase a windows 11 pro key, you can try contacting online Chat support and ask them to activate you with a new key.
You can contact Chat via the following method:
Go to the following Web site: Contact - Microsoft Support.
Select Contact Support(sign in to your personal Microsoft account).
Under Products and services, select options related to your product.
UnderCategory, selectManage my subscription.
Go to Confirm.
Select Chat with a support representative or request a callback.
Thank you for your understanding and patience. I hope your problem is solved successfully.
I look forward to your feedback.
Best Regards,
Aaron| Microsoft Community Support Specialist