Apex domains cannot have CNAME records.
Question and response
Question
dig towyan.org. NS
Answer
towyan.org. 5 NS ns-163.awsdns-20.com.
towyan.org. 5 NS ns-844.awsdns-41.net.
towyan.org. 5 NS ns-639.awsdns-15.net.
towyan.org. 5 NS ns-1829.awsdns-36.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0