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When you install or reinstall a Microsoft Office 2016, you are prompted to type or to paste the 25-character product key. The product key is used during the Microsoft software installation to unlock the Microsoft Office suite. If you do not enter the product key when you are prompted, the suite may be locked. In a locked state, the functionality of the applications will be limited.
To find this, we can go into your email you purchased office with if you still have that and also use the download you used for your 2016 as it will be there also, unless you purchased a cd?
How did you acquire/purchase your 2016?