I got this issue too.
4y old PC I built myself, originally W10 Pro but later I upgraded the OS to W11 Pro. Last weekend I decided to update BIOS from version 4802 to 5003 (motherboard = Asus ROG Strix x570-E Gaming). In the BIOS changelog it says:
- Update AGESA version to ComboV2PI 1.2.0.B
- Update AMD 5000/3000 Series CPU fTPM version, please back up Bitlocker recovery key before updating this version BIOS.
I use Bitlocker, which I suspended before the update (recovery key is already backed up). After the update the motherboard prompted me to reset the fTPM to keep using it. OK, not a problem, I had to recreate my Win Hello PIN and log in again to couple of apps etc.
However, later that day i got the "Activate Windows" watermark at the lower right corner of the display. On closer inspection it says the hardware has changed (error code 0xC0EA000A)... yet the hardware is exactly the same as before. Activation troubleshooter is unable to fix the issue. I checked the list of devices on my Microsoft account, and the PC with the activation issue is shown twice.
I created a support ticket via "Get Help" app. Yesterday the ticket state has changed to "Resolved". No-one has contacted me at all and the issues is still there.
How do I get this fixed? A simple firmware update should never invalidate a legit licence.