The "Product Activation Failed" error in Microsoft Office arises when the application cannot verify your license or ...

Office 2010 will now use Key Management Service (KMS) to activate your product, further simplifying the installation process of Office 2010. KMS eliminates the need to manually enter license codes ...

It's not just you, there is indeed an activation problem in Microsoft 365 Office triggered by administrators making changes at the licensing level.… The problem has been ongoing for a few months ...