Apex domains cannot have CNAME records.
Question and response
Question
dig jobaffinity.fr. NS
Answer
jobaffinity.fr. 5 NS mallory.ns.cloudflare.com.
jobaffinity.fr. 5 NS harlan.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0