Apex domains cannot have CNAME records.
Question and response
Question
dig debitrx.net. NS
Answer
debitrx.net. 5 NS ns1.myinfra.fr.
debitrx.net. 5 NS ns2.myinfra.net.
debitrx.net. 5 NS ns3.myinfra.net.
Authority
The response has no authority records.
Additional
ns1.myinfra.fr. 5 A 185.76.229.171
ns2.myinfra.net. 5 A 103.88.174.14
ns3.myinfra.net. 5 A 162.44.245.251
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0