Apex domains cannot have CNAME records.
Question and response
Question
dig symplicity.com. NS
Answer
symplicity.com. 4 NS ns-1249.awsdns-28.org.
symplicity.com. 4 NS ns-258.awsdns-32.com.
symplicity.com. 4 NS ns-870.awsdns-44.net.
symplicity.com. 4 NS ns-1790.awsdns-31.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0