Apex domains cannot have CNAME records.
Question and response
Question
dig pitdc1.expedient.net. NS
Answer
pitdc1.expedient.net. 5 NS auth3.dns.expedient.com.
pitdc1.expedient.net. 5 NS auth1.dns.expedient.com.
pitdc1.expedient.net. 5 NS auth2.dns.expedient.com.
Authority
The response has no authority records.
Additional
auth1.dns.expedient.com. 5 A 209.166.168.15
auth3.dns.expedient.com. 5 A 207.54.143.204
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0