Apex domains cannot have CNAME records.
Question and response
Question
dig cribbreeze.com. NS
Answer
cribbreeze.com. 5 NS ns-501.awsdns-62.com.
cribbreeze.com. 5 NS ns-1937.awsdns-50.co.uk.
cribbreeze.com. 5 NS ns-1738.awsdns-25.co.uk.
cribbreeze.com. 5 NS ns-565.awsdns-06.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0