Apex domains cannot have CNAME records.
Question and response
Question
dig joannfryerthomas.com. NS
Answer
joannfryerthomas.com. 5 NS ns-1120.awsdns-12.org.
joannfryerthomas.com. 5 NS ns-1277.awsdns-31.org.
joannfryerthomas.com. 5 NS ns-100.awsdns-12.com.
joannfryerthomas.com. 5 NS ns-1032.awsdns-01.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0