You need to define Property Hostnames

You use this content panel to associate your cloud partner endpoint to an Akamai Edge hostname. A "property hostname" association plays a key role in getting subcustomer sites, applications or content out to our Edge servers, for access to requests from subcustomer clients.

Once set up, a request from an end user to a subcustomer resource is resolved by the Edge hostname. The request is routed to our Edge servers that then read your ACE base configuration to determine how to serve requests for subcustomer content.