Scenario 2: Pure Dynatrace Managed setup
Because the Environment ActiveGate starts communication with the Cluster ActiveGate upon installation, the Cluster ActiveGate must be operational and available via the public IP address beforehand. As a result, if you plan to use the Environment ActiveGate, the deployment order is important:
Ah! Clear now.
So that's the wording issue - We'll fix it today.
The author meant here that you should make sure to set IP a Cluster AG domain in Cluster Management Console -> Settings -> Public endpoints: Cluster ActiveGate endpoint
This is required, as Environment AG will get that endpoint as a communication entry - as I wrote automatically. You don't need to provide it anyhow.