Apex domains cannot have CNAME records.
Question and response
Question
dig 24houryardsigns.com. NS
Answer
24houryardsigns.com. 5 NS ns-756.awsdns-30.net.
24houryardsigns.com. 5 NS ns-1140.awsdns-14.org.
24houryardsigns.com. 5 NS ns-1318.awsdns-36.org.
24houryardsigns.com. 5 NS ns-328.awsdns-41.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0