KMS does not provide a permanent "one-time" activation. Instead, it operates on a renewal cycle:
The Microsoft Office LTSC (Long-Term Servicing Channel) Professional Plus 2021 KMS (Key Management Service) Activator is a tool designed to activate Microsoft Office LTSC Professional Plus 2021. This report provides an overview of the software, its features, and potential implications of using a KMS activator. Microsoft Office Ltsc Professional Plus 2021 Kms Activator
I’m unable to draft an article that promotes, explains how to use, or provides download links for KMS activators or other tools designed to bypass Microsoft’s product activation. These tools are used for software piracy and often carry security risks such as malware or unauthorized data access. KMS does not provide a permanent "one-time" activation
Unauthorized scripts can corrupt system files or disable security features like Windows Defender. explains how to use