Apex domains cannot have CNAME records.
Question and response
Question
dig igdcs.com. NS
Answer
igdcs.com. 5 NS ns1.sandbox.global.ingenico.com.
igdcs.com. 5 NS dns1.p03.nsone.net.
igdcs.com. 5 NS ns1.preprod.global.ingenico.com.
igdcs.com. 5 NS dns3.p03.nsone.net.
igdcs.com. 5 NS dns4.p03.nsone.net.
igdcs.com. 5 NS ns1.global.ingenico.com.
igdcs.com. 5 NS dns2.p03.nsone.net.
Authority
The response has no authority records.
Additional
ns1.global.ingenico.com. 5 A 185.8.54.43
ns1.preprod.global.ingenico.com. 5 A 185.8.54.72
ns1.sandbox.global.ingenico.com. 5 A 185.8.54.99
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0