Apex domains cannot have CNAME records.
Question and response
Question
dig jfc.dev. NS
Answer
jfc.dev. 5 NS ns-1332.awsdns-38.org.
jfc.dev. 5 NS ns-743.awsdns-28.net.
jfc.dev. 5 NS ns-245.awsdns-30.com.
jfc.dev. 5 NS ns-1765.awsdns-28.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0