Apex domains cannot have CNAME records.
Question and response
Question
dig pdint.net. NS
Answer
pdint.net. 4 NS ns-1324.awsdns-37.org.
pdint.net. 4 NS ns-141.awsdns-17.com.
pdint.net. 4 NS ns-792.awsdns-35.net.
pdint.net. 4 NS ns-1670.awsdns-16.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0