Apex domains cannot have CNAME records.
Question and response
Question
dig autotask.com. NS
Answer
autotask.com. 5 NS ns1.autotask.com.
autotask.com. 5 NS ns3.autotask.com.
autotask.com. 5 NS ns5.autotask.com.
autotask.com. 5 NS ns2.autotask.com.
autotask.com. 5 NS ns4.autotask.com.
Authority
The response has no authority records.
Additional
ns1.autotask.com. 5 A 208.94.148.2
ns2.autotask.com. 5 A 208.80.124.2
ns3.autotask.com. 5 A 208.80.126.2
ns4.autotask.com. 5 A 208.80.125.2
ns5.autotask.com. 5 A 208.80.127.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0