For Windows Server 2019, the "KMS ISO" typically refers to the Volume License (VL) media available to enterprise customers. There isn't a specific "KMS-only" ISO; rather, the standard VL ISO comes pre-configured with Generic Volume License Keys (GVLKs). 1. ISO Download Links
If you have a volume license agreement, you must download the ISO from the Microsoft 365 Admin Center windows server 2019 kms iso link
Introduction
Set the KMS Host address:slmgr /skms Trigger the activation:slmgr /ato Troubleshooting Activation For Windows Server 2019 , the "KMS ISO"