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