Please provide below relate information to sales contact :
1. Device SN
2. Token number (Get from specify OU for device enrollment)
3. Account ID (For device enrollment)
We will upload your information to Google cloud server and pre-provision device for your account. Once we notice you it'd finish then you will see pre-provisioned device on your specify OU.
After that you just power on device and connect LAN to internet, it will sync to Google cloud sever for recognize device's SN then it will be provision and download your OU settings (or APP).
More information about Zero-touch enrollment please reference to Google support :