Apex domains cannot have CNAME records.
Question and response
Question
dig tiffanyfloraldesign.com. NS
Answer
tiffanyfloraldesign.com. 5 NS ns-678.awsdns-20.net.
tiffanyfloraldesign.com. 5 NS ns-1131.awsdns-13.org.
tiffanyfloraldesign.com. 5 NS ns-63.awsdns-07.com.
tiffanyfloraldesign.com. 5 NS ns-939.awsdns-53.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0