Apex domains cannot have CNAME records.
Question and response
Question
dig intercard-international.com. NS
Answer
intercard-international.com. 5 NS ns-681.awsdns-21.net.
intercard-international.com. 5 NS ns-1006.awsdns-61.net.
intercard-international.com. 5 NS ns-478.awsdns-59.com.
intercard-international.com. 5 NS ns-758.awsdns-30.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0