Apex domains cannot have CNAME records.
Question and response
Question
dig auth5.dns.datapointinc.net. NS
Answer
auth5.dns.datapointinc.net. 5 NS auth5.dns.expedient.com.
auth5.dns.datapointinc.net. 5 NS auth1.dns.expedient.com.
auth5.dns.datapointinc.net. 5 NS auth2.dns.expedient.com.
auth5.dns.datapointinc.net. 5 NS auth3.dns.expedient.com.
auth5.dns.datapointinc.net. 5 NS auth4.dns.expedient.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0