Apex domains cannot have CNAME records.
Question and response
Question
dig sfrbusinessteam.fr. NS
Answer
sfrbusinessteam.fr. 5 NS ns1.sfrbusinessteam.fr.
sfrbusinessteam.fr. 5 NS ns2.sfrbusinessteam.fr.
Authority
The response has no authority records.
Additional
ns1.sfrbusinessteam.fr. 5 A 86.64.239.11
ns2.sfrbusinessteam.fr. 5 A 84.96.147.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0