Usually, you'd activate Windows 11 (or 10) using the Settings app to enter ... Command Prompt to activate a Windows license ...
Key Management Service or KMS is a part of Volume Licensing for Windows Activation. When activating your Windows, if you get an error code 0xC004F038 with the message ...
The Key Management Server (KMS) is unavailable OR No Key Management ... If you cannot activate Windows 10, open Settings > Update & security and click on the Activation button on the left panel.