With past versions of Microsoft Office, you could automatically activate Office by adding the property value AUTO_ACTIVATE = 1 using the Microsoft Office Customization Tool. This is no longer the case with Office 2016 as the AUTO_ACTIVATE property seems to have been deprecated. To get around this, you will need to have Office run a script after being installed that will activate itself automatically in the background.
Launch the Microsoft Office Customization Tool (setup.exe /admin) and generate a new setup customization file or open an existing one. Click on the entry “Add installations and run programs” and add a new program entry with the following options:
Arguments: “C:\Program File\Microsoft Office\Office 16\OSPP.VBS” /ACT
Save the setup customization file to the updates folder and run the Office installer. When the installation finishes launch Microsoft Word and navigate to File > Account. You should be greeted with a screen similar to image below, with Microsoft Office being successfully activated.