Windows 11 is no longer activated after a BIOS update and cannot be reactivated

After a BIOS update, my Windows 11 Pro is no longer activated, and I can't reactivate it using the troubleshooter either, as the license apparently can no longer be found in my Microsoft account.

Unfortunately, I can’t remember whether I activated Windows with a product key or via a Windows 7 Pro upgrade.

Is there a way to reactivate my Windows 11 without having to buy a new copy of Windows 11? It was activated before the BIOS update.

No Hardware Change.