Good day, thanks for your question. I am glad to assist you today. If you have upgraded from Windows 10 to Windows 11, you can download the ShowKeyPlus app from the Microsoft Store or you can also open Command Prompt from either search or by pressing Windows key + R and type in cmd and press Enter and from there you can copy and paste the command below and then press Enter afterwards.
wmic path SoftwareLicensingService get OA3xOriginalProductKey
Regards,
Paul R.