Just sharing.

I just build a PC and download Windows 10 from original Microsoft website.

When installation, it asked for license keys, but I chose skip.

Then during installation, I login to my Microsoft Account and then its activated already. I didnt insert any keys though.

I remember I changed mobo a few weeks ago, and windows 10 detecting the machine have something changed so its suddenly not activated anymore.

I just login again to my Microsoft account and then its activate and works as usual again.

Windows : Windows 10 Pro
Activation : Windows is activated with a digital license linked to your Microsoft Account.