Apex domains cannot have CNAME records.
Question and response
Question
dig ccptax.com. NS
Answer
ccptax.com. 5 NS ns-732.awsdns-27.net.
ccptax.com. 5 NS ns-259.awsdns-32.com.
ccptax.com. 5 NS ns-544.awsdns-04.net.
ccptax.com. 5 NS ns-1885.awsdns-43.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0