MDM solution preferences in Apple Configurator 2
You can create references to mobile device management (MDM) servers, which your iPhone, iPad, and Apple TV devices contact for enrollment in MDM. From the Apple Configurator 2 
menu, choose Preferences > Servers. You’ll need the following information:
Description: A name for the server, which may be based on location, grade level, or something else easy for you to remember.
Enrollment URL: The fully qualified domain name (FQDN) or IP address of your MDM server. Apple Configurator 2 attempts to ask the MDM server for the full enrollment URL.
If the default FQDN or IP address doesn’t return the correct information, consult your MDM vendor.