Apex domains cannot have CNAME records.
Question and response
Question
dig icademie-lille.com. NS
Answer
icademie-lille.com. 5 NS ns-1446.awsdns-52.org.
icademie-lille.com. 5 NS ns-1622.awsdns-10.co.uk.
icademie-lille.com. 5 NS ns-587.awsdns-09.net.
icademie-lille.com. 5 NS ns-1507.awsdns-60.org.
Authority
The response has no authority records.
Additional
ns-1622.awsdns-10.co.uk. 2 A 205.251.198.86
ns-1622.awsdns-10.co.uk. 2 AAAA 2600:9000:5306:5600:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0