Client ID on PreStage Enrollment Not Taking

[rickwhois]

I'm trying to get the $SERIALNUMBER to be the computer name of Macs that are joined to AD in a DEP PreStage Enrollment. $SERIALNUMBER doesn't seems to work it keeps defaulting to Macbook Air or whatever the device type is.

This device has been in JSS prior to re-enrollment. Any clues as to where I should be digging?

[rickwhois]

Just following up here... so it does bind as the serial number, but doesn't change the host name on the client. I suppose I could just add a script post DEP to update the hostname/host/computername.

Can anyone confirm this is normal behavior?