Apex domains cannot have CNAME records.
Question and response
Question
dig cassedyassociates.com. NS
Answer
cassedyassociates.com. 5 NS ns-1350.awsdns-40.org.
cassedyassociates.com. 5 NS ns-1937.awsdns-50.co.uk.
cassedyassociates.com. 5 NS ns-1622.awsdns-10.co.uk.
cassedyassociates.com. 5 NS ns-1562.awsdns-03.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0