[EC2] How to handle Windows activation failure

Issue

• Windows was activated but is now in a deactivated state. 

Cause 

• Windows instances use Microsoft's KMS (Key Management System) provided by AWS for activation. If the instance cannot connect to the KMS server, a Windows activation error message may appear. There may also be an issue with the KMS client configuration. 

Solution

• Use Systems Management Automation documentation to activate Windows 

• Manual Windows activation 

• For detailed instructions, refer to the document below
  https://aws.amazon.com/ko/premiumsupport/knowledge-center/windows-activation-fails/