Apex domains cannot have CNAME records.
Question and response
Question
dig southernpoolsoftampabay.com. NS
Answer
southernpoolsoftampabay.com. 5 NS ns-1229.awsdns-25.org.
southernpoolsoftampabay.com. 5 NS ns-742.awsdns-28.net.
southernpoolsoftampabay.com. 5 NS ns-311.awsdns-38.com.
southernpoolsoftampabay.com. 5 NS ns-1476.awsdns-56.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0