You can re-enter Your Product Key:
Go to Settings > System> Activation.
Select Change product key and re-enter your Windows product key.
or
Reactivate Windows Using Your Microsoft Account
or
revert to the Previous BIOS Version:
If the BIOS update caused the issue, reverting to the previous version might help. Check your motherboard manufacturer’s website for instructions on how to downgrade your BIOS.
I have also found this windows help article: https://support.microsoft.com/en-us/windows/rea...
Let me know how that helps.