Apex domains cannot have CNAME records.
Question and response
Question
dig tiptoenervous.com. NS
Answer
tiptoenervous.com. 5 NS ns-427.awsdns-53.com.
tiptoenervous.com. 5 NS ns-109.awsdns-13.com.
tiptoenervous.com. 5 NS ns-1791.awsdns-31.co.uk.
tiptoenervous.com. 5 NS ns-734.awsdns-27.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0