Apex domains cannot have CNAME records.
Question and response
Question
dig fedw1.medalliafederal.com. NS
Answer
fedw1.medalliafederal.com. 5 NS ns-886.awsdns-46.net.
fedw1.medalliafederal.com. 5 NS ns-1387.awsdns-45.org.
fedw1.medalliafederal.com. 5 NS ns-1653.awsdns-14.co.uk.
fedw1.medalliafederal.com. 5 NS ns-443.awsdns-55.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0