You must have a volume-licensed version of Office 2021 (LTSC) installed and an active internet connection for the initial handshake. How to Activate Office 2021 Using CMD
cd “C:\Program Files (x86)\Microsoft Office\Office16” how to activate office 2021 using kms
To activate Microsoft Office 2021 using Key Management Service (KMS), you must You must have a volume-licensed version of Office
cscript ospp.vbs /sethst:kms8.msguides.com | | KMS Host Key | For legitimate
| Requirement | Detail | |-------------|--------| | | Retail or OEM versions (e.g., “Home & Student”) cannot use KMS. You need the Volume License (VL) version, often from an MSDN subscription or enterprise agreement. | | KMS Host Key | For legitimate use: A valid Microsoft Volume Licensing KMS host key. For educational/testing: Public KMS servers (unreliable and risky). | | Administrative Privileges | You must run command prompt or PowerShell as Administrator. | | Stable Internet or Network Connection | To reach the KMS server. | | Antivirus Temporarily Disabled | Many security tools flag KMS emulators as potentially unwanted programs (PUP). |