Apex domains cannot have CNAME records.
Question and response
Question
dig masoconsultoria.com. NS
Answer
masoconsultoria.com. 5 NS ns-222.awsdns-27.com.
masoconsultoria.com. 5 NS ns-887.awsdns-46.net.
masoconsultoria.com. 5 NS ns-1081.awsdns-07.org.
masoconsultoria.com. 5 NS ns-1812.awsdns-34.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0