Issue with Windows installation and licensing.
Issue with Windows installation and licensing.
Contact Microsoft Support, they seem relaxed and likely to assist you effectively
Additionally, Windows likely detected the new motherboard and marked your key as invalid due to the change. However, I mentioned that contacting Microsoft support would be the most effective solution.
Uncertain about the contact issue with MS. I've faced similar problems before when upgrading components—then they would disconnect the PC, modify registry keys, and issue a new license after the previous one became unresponsive.
It's likely your key is single activation only and needs additional steps. Kinguins or the seller could be better choices. Microsoft can assist if they identify it as a volume pack or enterprise activation. Support for these cases should go through the company's tech support.