The method used to activate Windows for single-user licenses starting with Windows XP and Windows Server 2003. Bulk licenses to companies do not contain Windows Product Activation (WPA).

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 ...

Preliminary fixes include verifying the status of your Microsoft 365 subscription ... Office subscription or product key. An ...