A client recently wanted to Add Windows 10 Activation to his KMS Server , you need this https://support.microsoft.com/en-us/kb/3086418

Proves you need some Windows Updates as well as a “Windows Srv 2012R2 DataCtr/Std KMS for Windows 10” Key

The update just downloads a file and extracts a pkeyconfig-csvlk.xrm-ms to C:\Program Files (x86)\Windows Kits\10\Assessment and Deployment Kit\VAMT3\pkconfig  if the windows update doesn’t work for you. You will need to reopen the VAMT3.1 app after adding this file

It seems you need to call VLSC  ( https://www.microsoft.com/licensing/servicecenter/Help/Contact.aspx ) Services to get this key added to your portal as they don’t release it online

Option 4 , then 2 

You will need to give them your agreement number ( Login online and go to Administration , My Permissions ) and Read out the Agreement Number ( Started with V )  under Licensing ID

However I was only being given Windows Srv 2012R2 DataCtr/Std KMS after multiple calls

The “Windows Server 2012 R2 with Windows 10” KMS key is only displayed using the Microsoft Article above or on the phone but to get that key, you need to have an active Software Assurance for Windows Server 2012 R2.

It relies on Server Datacenter having SA. It’s a new Class C key.

The 2012 R2 Datacenter key (of the past) activated Windows 8.1 Enterprise but it wasn’t aware of Windows 10. This is a new Datacenter key that also activates Windows 10 Enterprise (and below).

How to Add Office 2016 Key to VAMT 3.1

Download from VLSC “SW_DVD5_Office_Professional_Plus_2016_W32_English_-2_KMS_MLF_X20-96058.iso”

Mount or Extract the ISO

Run kms_host.vbs in command prompt as admin , however this doesn’t work

Copy from Win8 folder pkeyconfig-office-kmshost.xrm-ms to C:\Program Files (x86)\Windows Kits\10\Assessment and Deployment Kit\VAMT3\pkconfig 

Once done , restart VAMT and try adding the key as well

—————————————— How to increase the KMS count to 25

As an easier alternative, we advice using the following script that allows to increase the activations count on the KMS server. Install the necessary version of the OS (in this example, it is Windows 7 Professional), create an any directory and copy the following BAT file into it. Then in the same folder create two empty files named:

7B296FB0-376B-497e-B012-9C450E1B7327-5P-0.C7483456-A289-439d-8115-601632D005A0
7B296FB0-376B-497e-B012-9C450E1B7327-5P-1.C7483456-A289-439d-8115-601632D005A0

Run increase_kms_count.bat:

@echo off
set skms=kmssrv1.woshub.com
for %%i in (. . . . . . . . . . . . . . . . . . . . . . . . . .) do call :Act %skms%
slmgr /ato
sc stop sppsvc
goto :end
:Act
sc stop sppsvc
xcopy "7B296FB0-376B-497e-B012-9C450E1B7327-5P-0.C7483456-A289-439d-8115-601632D005A0" "%systemroot%\system32\*" /H /R /K /Y
xcopy "7B296FB0-376B-497e-B012-9C450E1B7327-5P-1.C7483456-A289-439d-8115-601632D005A0" "%systemroot%\system32\*" /H /R /K /Y
sc start sppsvc
cscript "%systemroot%\system32\slmgr.vbs" /skms %1
cscript "%systemroot%\system32\slmgr.vbs" /ipk FJ82H-XT6CR-J8D7P-XQJJ2-GPDD4
cscript "%systemroot%\system32\slmgr.vbs" /ato
sc stop sppsvc
:end

kms1.woshub.com is a DNS name or an IP address of your KMS server.

The number of dots in the line 3 is the necessary amount of requests to the KMS server (in this example, we drive up to 25 requests)

After the script is executed, check the KMS count:

1

slmgr –dlv

or you can try the app https://forums.mydigitallife.info/threads/39665-KMS-Client-Emulator-for-Increasing-KMS-Server-Client-Count