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:  … Continue reading When adding Office 2016 product keys to KMS – The specified KMS product key is invalid, of is unsupported by this version of VAMT. An update to support additional products may be available online.