Apex domains cannot have CNAME records.
Question and response
Question
dig outfunnel.com. NS
Answer
outfunnel.com. 5 NS ns-1724.awsdns-23.co.uk.
outfunnel.com. 5 NS ns-1468.awsdns-55.org.
outfunnel.com. 5 NS ns-495.awsdns-61.com.
outfunnel.com. 5 NS ns-824.awsdns-39.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0