Apex domains cannot have CNAME records.
Question and response
Question
dig www2019sp.com. NS
Answer
www2019sp.com. 5 NS ns-1076.awsdns-06.org.
www2019sp.com. 5 NS ns-714.awsdns-25.net.
www2019sp.com. 5 NS ns-1990.awsdns-56.co.uk.
www2019sp.com. 5 NS ns-1521.awsdns-62.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0