Thanks, Dave. I understand that Microsoft Support should be able to find the licence linked to my account and reactivate it.
The problem is that I have not been able to find a way to contact Microsoft Support directly for this activation issue. I have already gone through Microsoft's Contact Support / Get Help routes and the Activation Troubleshooter, but these ultimately sent me back to the Product Activation Portal. The portal rejected my Installation ID with “We’re sorry, your Installation ID was unable to be validated.”
I was only able to contact Razer directly, and they have now escalated the issue to their support specialists because the problem occurred after the BIOS update.
If you know of a specific way to reach a Microsoft activation specialist directly, I would appreciate the link or instructions.