Your Microsoft Office Product Key is a series of 25 letters and numbers that must be entered when software is activated on your devices. This Key certifies that the software is an original copy and has not been pirated from another source. If your PC or laptop came with Office pre-installed on it, then before following this entire procedure, search the case at the back or the sides to find the sticker that contains the Key.
In the Microsoft world, if you have Office 365, you will not have a Product Key as your ownership of the software is managed online through the Microsoft website. Losing the Product Key means that you cannot activate and use your Microsoft Office products, so you must find the Key. Fortunately, uncovering your Key is a straightforward procedure.
1. Go to the Microsoft Website
Go to the Microsoft website and sign in to your account by clicking on the figure in the top right-hand corner of the screen.
2. Go to Services and Subscriptions
Click on Services and Subscriptions in the blue menu at the top of the screen.
3. Scroll to find the Key
Scroll down the screen until you find the Product Key that you need. Once you find the line you are looking for, click on View Product Key.
Read More: https://microsoft-office.en.softonic.com/articles/how-to-find-your-microsoft-office-product-key