Apex domains cannot have CNAME records.
Question and response
Question
dig credicogroup.com. NS
Answer
credicogroup.com. 5 NS ns-1941.awsdns-50.co.uk.
credicogroup.com. 5 NS ns-844.awsdns-41.net.
credicogroup.com. 5 NS ns-26.awsdns-03.com.
credicogroup.com. 5 NS ns-1116.awsdns-11.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0