Apex domains cannot have CNAME records.
Question and response
Question
dig polinurate.com. NS
Answer
polinurate.com. 5 NS ns-206.awsdns-25.com.
polinurate.com. 5 NS ns-1110.awsdns-10.org.
polinurate.com. 5 NS ns-228.awsdns-28.com.
polinurate.com. 5 NS ns-1242.awsdns-27.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0