If you receive this error while trying to import your Windows 10 product keys to KMS VAMT server 3.1, it means that you need to upgrade your VAMT version.
It is not possible to import Windows 10 keys in VAMT 3.1 keys.
Download the adk from here
http://go.microsoft.com/fwlink/p/?LinkId=526740
Installation:
1. If you don’t have .Net framework on your KMS server the setup will install it, After the .net installation the server will reboot
2. Specify location
3. Privacy
4. License Agreement
5. Select VAMT
6. Installing
7. Done
8. Open
9. Choose the VMAT DB And connect
10. Import your windows 10 product key
Good luck! 
Sr. Cloud Solution Architect at Microsoft, I’m passionate about helping customers succeed by building secure, scalable, and innovative cloud solutions – with a strong focus on AI, DevOps practices, and end-to-end security. With a proven track record in the IT and services industry, I serve as a trusted advisor, partnering closely with organizations to guide them through digital transformation and maximize the value of their cloud investments.
My role combines technical leadership with project ownership – from designing modern architectures to leading cross-functional implementations that drive real business outcomes. I also manage and empower strategic partners, working hand-in-hand with them to ensure project success and deliver measurable business impact for customers.