KMS Server 2016 - doesn't accept Server 2019 CSVLK or GVLK

Lanky Doodle 226 Reputation points


I have a 2016 KMS Server and I am trying to add my CSVLK Host Key and the GVLK for Server 2019. None of them work, either in VAMT or SLMGR.VBS. Get "unsupported key" in VAMT and something about "Server Core" in SLMGR.VBS. I'm not using Server Core.

The Server has latest SSU and January 2022 CU, which I read is the main cause of this issue (Server 2016 not being updated enough).

What am I missing?


Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
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  1. Limitless Technology 39,341 Reputation points

    Hello Lanky Doodle,

    It would help if you can post the specific error. Also have you confirmed that the CSVLK you have installed on the 2016 server is valid to activate Windows Server 2019? Also, please ensure that the KMS Host is fully updated.

    Other relevant information about KMS deployments can be found here:


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