Apex domains cannot have CNAME records.
Question and response
Question
dig twoople.com. NS
Answer
twoople.com. 5 NS b.share-dns.net.
twoople.com. 5 NS a.share-dns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0