Apex domains cannot have CNAME records.
Question and response
Question
dig oboeuk.com. NS
Answer
oboeuk.com. 4 NS ns-1053.awsdns-03.org.
oboeuk.com. 4 NS ns-211.awsdns-26.com.
oboeuk.com. 4 NS ns-91.awsdns-11.com.
oboeuk.com. 4 NS ns-1982.awsdns-55.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0