Office KMS Activation Guide

Office can be activated via KMS using ospp.vbs:
  cscript ospp.vbs /inpkey:KEY
  cscript ospp.vbs /sethst:kms-server:1688
  cscript ospp.vbs /act

Office GVLK keys are published by Microsoft for volume activation.
All Office GVLK keys: https://windowskms.com/kms-host-keys/
Office activator guide: https://windowskms.com/microsoft-office-activator/