The license is linked to your account but not your PC's motherboard. In order to solve this problem, you better just buy a cheap RM4.50 Windows 10 license key to activate your Windows 10 without depending on your Microsoft account. This is the only best, cheapest, easiest and fastest way.

https://shopee.com.my/Microsoft-Windows-10-...8724.7301114017

I was bought a mini PC from taobao at 2 days ago then bought a Windows 10 Pro key from this seller. Chat with him then wait for his reply after few hours. After I get the key just straight activated. Even after that I get reformat the mini PC again, I did repartition, reformat new drive, then did boot clean install by USB drive. After that, login to Windows with offline account. Everything is fine and just logged in as pre-activated.

You can do it but just beware if someone might report to BSA. My advise is better don't do this in shop and company. Usually is safe for personal use.

If your company have volume licensing then you know how, normally enterprise will using volume licensing.
Volume Licensing - one key for all.

Microsoft use based on trust, so even you only buy for 200 units but you get activation of at least 2500 times as minimum.
This activation will get increase based on total quantities you purchase.

Those seller is basically illegally selling the valid key from Volume Licensing. Thus it is valid forever unless you get suspect by Microsoft.