Apex domains cannot have CNAME records.
Question and response
Question
dig bbk2020.shop. NS
Answer
bbk2020.shop. 4 NS ns-874.awsdns-45.net.
bbk2020.shop. 4 NS ns-346.awsdns-43.com.
bbk2020.shop. 4 NS ns-1379.awsdns-44.org.
bbk2020.shop. 4 NS ns-1284.awsdns-32.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0