Hello,
When dealing with license activation issue, the very first step is to understand the type of license you are using, because activation methods can differ.
So, please tell me how you obtained your pro license initially?
Did you purchase it, or did it come with the device?
If you purchased it, did you get it from Microsoft, or third party? Was it initially Home and you purchased the upgrade to Pro?
Any hardware change lately? Or is this a new install?