Apex domains cannot have CNAME records.
Question and response
Question
dig sxicpa.org. NS
Answer
sxicpa.org. 5 NS ns-688.awsdns-22.net.
sxicpa.org. 5 NS ns-1417.awsdns-49.org.
sxicpa.org. 5 NS ns-1188.awsdns-20.org.
sxicpa.org. 5 NS ns-865.awsdns-44.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0