1. Cisco Packaged Contact Center Enterprise Installation and Upgrade Guide
Release 12.6(1)
Chapter: "Prepare for the Installation"
Section: "Active Directory Domain"
Subsection: "Create Service User Account".
This section explicitly states
"The domain user account for Cisco services is the account under which you install the Packaged CCE components. This account is also the service account for the central controller and other components." It details that this account must be a domain user and a member of the local Administrators group on each target server
which is precisely what the wizard uses.
2. Cisco Packaged Contact Center Enterprise Administration and Configuration Guide
Release 12.5(1)
Chapter: "Deployment"
Section: "PCCE Deployment".
This guide describes the deployment process which relies on the Unified CCE Web Administration tool and its wizards. The prerequisites for this process consistently highlight the need for a pre-configured domain service account with specific permissions to execute the installation and configuration steps across all solution components.