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