Following from this thread:
It looks insane that one needs to activate Win 10 Pro Retail to be able to use Enterprise Subscription Activation
All machines were purchased with NO OS (hence for MSDM firmware-embedded key), because legal license (OWS) allowed to run local KMS server
So they all are already Enterprise and KMS activated
Now they all going to be wiped and fresh Enterprise install will happen (no local LAN, no AD, no KMS)
How am I supposed to proceed?
No, I did not find the answer in: https://docs.microsoft.com/en-us/windows/deployment/windows-10-subscription-activation