Apex domains cannot have CNAME records.
Question and response
Question
dig renardbleu.dev. NS
Answer
renardbleu.dev. 5 NS ac1.cloudcone.net.
renardbleu.dev. 5 NS ac2.cloudcone.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0