Hello,
Don’t upgrade system if your laptop has an OEM system when bought. Such as OEM system is Home then you upgrade it to Pro, then you will see this error message.
For current situation, there are three method:
1.restore system to factory, backup your important date
2.contact OEM support for help
3.reinstall the same system as before and it will use the product key stored in UEFI to activate itself.
Regards