Add Office 2016 Key to KMS server:
In order to add the KMS you need to install the Microsoft Office 2016 Volume License Pack
1. Download the Microsoft Office 2016 Volume License Pack fro here
https://www.microsoft.com/en-us/download/details.aspx?id=49164
Follow the steps:
Click Yes
Enter the Product Key
Open VMAT to see the new office 2016 product key
Good luck! 
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