Apex domains cannot have CNAME records.
Question and response
Question
dig axapi.axcient.com. NS
Answer
axapi.axcient.com. 3 NS ns-1556.awsdns-02.co.uk.
axapi.axcient.com. 3 NS ns-21.awsdns-02.com.
axapi.axcient.com. 3 NS ns-671.awsdns-19.net.
axapi.axcient.com. 3 NS ns-1419.awsdns-49.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0