. This method uses Microsoft's own Key Management Service (KMS) infrastructure. How to Activate (Official KMS Method) Open Command Prompt as Admin : Search for "cmd," right-click it, and select Run as Administrator Navigate to the Office folder : Copy and paste the following command, then hit Enter:

A one-time activation through Microsoft's hosted services. You enter the key in the Office Customization Tool (OCT) or directly in the app under File > Account > Change Product Key .