Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Thank you for the information. You don’t need a product key if it's preinstalled. It activates by signing in with your Microsoft account.
Please open Word - File - Account
-If asked, sign in to activate.
If you're still having issues, please go to control Panel - Programs - Microsoft 365 - Change - Quick Repair
-If needed, please try Online Repair.