Apex domains cannot have CNAME records.
Question and response
Question
dig anthemaxehall.com. NS
Answer
anthemaxehall.com. 5 NS ns-121.awsdns-15.com.
anthemaxehall.com. 5 NS ns-554.awsdns-05.net.
anthemaxehall.com. 5 NS ns-231.awsdns-28.com.
anthemaxehall.com. 5 NS ns-1434.awsdns-51.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0