This happens when a KMS Client contacts the KMS host for activation, the host cannot activate the client computer.
0xC004F042, Specified Key Management Service (KMS) cannot be used
KMS based Windows 10 Activation keys are particular keys that cannot be used without a KMS server. If you happened to have a KMS key that was sold on the internet, while it may work for a while, but not forever. That said, KMS keys are usually used on Enterprise, where the KMS server is set up to activate the Windows computer, which is part of the enterprise. Here the are things you need to check if you receive this error: I hope the post was useful, and you were able to get rid of the error 0xC004F042 related to Key Management Service (KMS).
