Apex domains cannot have CNAME records.
Question and response
Question
dig twinnerwatch.com. NS
Answer
twinnerwatch.com. 5 NS ns-1898.awsdns-45.co.uk.
twinnerwatch.com. 5 NS ns-470.awsdns-58.com.
twinnerwatch.com. 5 NS ns-694.awsdns-22.net.
twinnerwatch.com. 5 NS ns-953.awsdns-55.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0