Apex domains cannot have CNAME records.
Question and response
Question
dig thesmallbizcoach.com. NS
Answer
thesmallbizcoach.com. 5 NS ns-1887.awsdns-43.co.uk.
thesmallbizcoach.com. 5 NS ns-1409.awsdns-48.org.
thesmallbizcoach.com. 5 NS ns-1740.awsdns-25.co.uk.
thesmallbizcoach.com. 5 NS ns-1804.awsdns-33.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0