If you already have a subscription but the app says "Unlicensed Product":
Large organizations often use Volume Licensing Service Center (VLSC) keys or Key Management Service (KMS). activation microsoft office 365
If you bought a physical key card or a digital key from an online retailer (like Amazon or Microsoft Store): If you already have a subscription but the
This guide details how activation works, the various methods available, and how to resolve common issues. the various methods available
Unlike older versions of Office (such as 2013 or 2016), which used a static 25-character Product Key for a one-time purchase, Office 365 operates on a subscription model.