Question
I get a new workstation shipped with Windows 11 instead of Windows 10.I like to know whether I can install Windows 10 from scratch then activate it using product key retrieve from Windows 11?
Answer
Windows 11 do not have new activation system; all the product keys are the same as Windows 10. You will first need to retrieve the product key from Windows 11, refer to this article for how to find and retrieve Product Key in Windows 11.
I have downloaded the Windows 10 install media and ran it on my system, after inputting the Windows 11 product key the system installed the OS without any problem.
Reference
Microsoft Docs > Q&A > Activating Windows 10 OS with Windows 11 key
Can I use a Windows 10 key for Windows 11?