Apex domains cannot have CNAME records.
Question and response
Question
dig grupostyrka.com. NS
Answer
grupostyrka.com. 5 NS ns-1124.awsdns-12.org.
grupostyrka.com. 5 NS ns-1147.awsdns-15.org.
grupostyrka.com. 5 NS ns-1191.awsdns-20.org.
grupostyrka.com. 5 NS ns-1092.awsdns-08.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0