Apex domains cannot have CNAME records.
Question and response
Question
dig portable-accessoire.com. NS
Answer
portable-accessoire.com. 5 NS ns-1382.awsdns-44.org.
portable-accessoire.com. 5 NS ns-1868.awsdns-41.co.uk.
portable-accessoire.com. 5 NS ns-1609.awsdns-09.co.uk.
portable-accessoire.com. 5 NS ns-1526.awsdns-62.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0