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Yes, I believe at some point while trying to get KMS working, an invalid key was installed on the machine we were using to image. &nbsp;I re-applied the key from the link you sent and that solved the issue. &nbsp;Thank you for your help!
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Yes, I believe at some point while trying to get KMS working, an invalid key was installed on the machine we were using to image.  I re-applied the key from the link you sent and that solved the issue.  Thank you for your help!

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Hello,<br />
<br />
I am trying to activate Windows 10 LTSB machines against a 2012 R2 KMS server. &nbsp;I have installed the KMS role on the server along with my 2012 datacenter KMS key which should be sufficient for activating a Windows 10 client.<br />
<br />
However, when my clients try to activate, they are getting the error message that the key was already used on another device, and it appears as though it is trying to activate with a MAK key.<br />
<br />
It doesn't even look like it is trying to activate against the KMS server. &nbsp;My office 2016 activations are working without an issue.<br />
<br />
I'm not sure what needs to be done to make this think look at the KMS server for the activation or to be sure that it is looking at the kms server for activation.
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Hello,

I am trying to activate Windows 10 LTSB machines against a 2012 R2 KMS server.  I have installed the KMS role on the server along with my 2012 datacenter KMS key which should be sufficient for activating a Windows 10 client.

However, when my clients try to activate, they are getting the error message that the key was already used on another device, and it appears as though it is trying to activate with a MAK key.

It doesn't even look like it is trying to activate against the KMS server.  My office 2016 activations are working without an issue.

I'm not sure what needs to be done to make this think look at the KMS server for the activation or to be sure that it is looking at the kms server for activation.

Windows 10 LTSB not activating against KMS Server

Windows 10 is a personal computer operating system featuring the "universal application architecture" (UAP); apps can be designed to run across multiple devices with nearly identical code, including PCs, tablets, smartphones, embedded systems, Xbox One, Surface Hub and HoloLens. Windows 10 also includes a virtual desktop system, a window and desktop management feature called Task View, the Microsoft Edge web browser, support for fingerprint and face recognition login, voice-based search (Cortana), new security features for enterprise environments, and DirectX 12 and WDDM 2.0 to improve the operating system's graphics capabilities for games.

Windows 10

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.