Remove Office 2016 Product Key

Open a command prompt as Administrator
In the command prompt, type the following:

Office 2016 (32-bit) on a 32-bit version of Windows
cscript “C:\Program Files\Microsoft Office\Office16\OSPP.VBS” /dstatus

Office 2016 (32-bit) on a 64-bit version of Windows
cscript “C:\Program Files (x86)\Microsoft Office\Office16\OSPP.VBS” /dstatus

Office 2016 (64-bit) on a 64-bit version of Windows
cscript “C:\Program Files\Microsoft Office\Office16\OSPP.VBS” /dstatus

You should now get a screen with some license details such as the license name, type and the last 5 characters of the Product Key.

4. You can use the last 5 characters of the Product Key to remove it using command:

Office 2016 (32-bit) on a 32-bit version of Windows
cscript “C:\Program Files\Microsoft Office\Office16\OSPP.VBS” /unpkey:

Office 2016 (32-bit) on a 64-bit version of Windows
cscript “C:\Program Files (x86)\Microsoft Office\Office16\OSPP.VBS” /unpkey:

Office 2016 (64-bit) on a 64-bit version of Windows
cscript “C:\Program Files\Microsoft Office\Office16\OSPP.VBS” /unpkey: