Apex domains cannot have CNAME records.
Question and response
Question
dig GESEMP.CL. NS
Answer
GESEMP.CL. 5 NS bayan.ns.cloudflare.com.
GESEMP.CL. 5 NS ryleigh.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0