In this error message, the Office activation fails and you will encounter unlicensed product in the title bar of Office applications.
There are multiple reasons where we see the unlicensed product message on office program.
1. Your Computer is Running Out of Space
Outlook unlicensed error stops sending emails and receiving emails There will also be missing mail folder synchronization.
2. You’re Using a Non-Microsoft Product that’s Causing the Problem
Unlicensed error messages show when the product is inactive. Keep the product key in hand or a valid account to activate.