The device name is used to join the device to a domain. Joining a domain is optional, but if you plan to join we need a device ...

The device name is used to join the device to a domain. Joining a domain is optional, but if you plan to join we need a device name that's between 1 and 15 characters and doesn't contain these characters: ( ) \ / : * ? " < > |. Make sure it's not the same name as a device that's already on the domain. We've provided the alias for the device account -- you can use that as the device name, or you can change it.