In Cloud Platform, the first bare domain name you add to an environment is the
active domain for that environment. This is true with, or without the www
prefix. Environments containing no bare custom domains use the Acquia
default domain as the active domain.
Note
You can’t change the active domain for an environment. For more information, see this known issue.
Cloud Platform uses the active domain for several purposes, including:
For more information about adding domain names to environments, see Adding a domain name.