Windows 10 activation lost after hardware change – Troubleshooter didn’t detect my linked device

Hello,

I am having an issue with Windows 10 activation after replacing hardware in my PC.

Before the hardware change, my Windows 10 installation was properly activated, and Windows showed that the digital license was linked to my Microsoft account. The PC was signed in with that Microsoft account, and the device was also visible on my Microsoft account page.

After the hardware replacement, Windows automatically deactivated because it detected a hardware change.

I tried the Activation Troubleshooter and selected the option “I changed hardware on this device recently”, but the original device was not offered in the list, even though it had been linked to my Microsoft account before the change.

I also tried entering my original Windows 7 product key (the one on the sticker attached to the PC), which was used to activate Windows 7 before I upgraded to Windows 10 for free. However, Windows rejected the key with error code 0x803FA067.

This is not an OEM license, so as far as I understand it should be transferable after a hardware change.

Has anyone experienced this before?

What should I do next to restore activation? Is there a way to manually re-link the digital license to this hardware?

Thank you.