If you bought Office Home & Student, Office Home & Business, Office Professional, or individual Office apps from the Microsoft Store and you haven’t installed them yet, you can also view their product keys and install them from the Microsoft Store.
Install Office 365 with Product Key : office.com/setup
Here’s how to view your product key in the Microsoft Store:
- Go to www.microsoftstore.com. In the upper right-hand corner, select Sign in and enter the user ID and password you used to buy Office.
- After you sign in, select your name in the upper right-hand corner, and then select Order History.
- Locate the Office one-time purchase or individual Office app, and then select Install Office to view your product key.
Note that this product key won’t match the product key shown in My Office Account. This is normal.
For more details, visit : Microsoft Product key Errors for office 2016/2013