Apex domains cannot have CNAME records.
Question and response
Question
dig importacionesintermex.com. NS
Answer
importacionesintermex.com. 5 NS ns-1957.awsdns-52.co.uk.
importacionesintermex.com. 5 NS ns-322.awsdns-40.com.
importacionesintermex.com. 5 NS ns-1260.awsdns-29.org.
importacionesintermex.com. 5 NS ns-1306.awsdns-35.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0