Apex domains cannot have CNAME records.
Question and response
Question
dig cbmgc.org. NS
Answer
cbmgc.org. 5 NS ns-1543.awsdns-00.co.uk.
cbmgc.org. 5 NS ns-1684.awsdns-18.co.uk.
cbmgc.org. 5 NS ns-917.awsdns-50.net.
cbmgc.org. 5 NS ns-936.awsdns-53.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0