I am reinstalling Windows 10 on my Beelink Mini S.
Please contact me and advise where I can send a photo of the serial number in order to obtain the activation code.
If you log into Microsoft on your computer for Microsoft Store, cloud or email you should have a digital key registered to your account. You can check in Settings | System | Activation - if it says "you have a digital license registered to your microsoft account" then you can install 10 Home or Pro and 11 Home and Pro. Just begin install and select you don't have a license. When you login to Microsoft on that PC after install the license will be Active. If it says anything other than what I typed above you don't own Windows. In that case you need a key. You can get that easy. Do this:
The most direct method for finding your Windows 10 product key is from the command line. Type “cmd" into the Windows 10 desktop search box and then right-click the command line result and select “run as administrator” from the context menu. Type this command at the prompt: wmic path softwareLicensingService get OA3xOriginalProductKey
Beelink uses UEFI "WinPE" based image (digital license included) -- the Windows product key is included. If you upgrade your SSD, you could clone your existing SSD to the new one without having to backup and reinstall your files/folders/apps. There are several ways and tools to accomplish just that.
If this is not what you are looking for, I would suggest you to contact @Support-03 (George) directly at Support-PC@bee-link.com and ask for a product key.