Apex domains cannot have CNAME records.
Question and response
Question
dig fdstj.org. NS
Answer
fdstj.org. 5 NS ns-1683.awsdns-18.co.uk.
fdstj.org. 5 NS ns-1676.awsdns-17.co.uk.
fdstj.org. 5 NS ns-324.awsdns-40.com.
fdstj.org. 5 NS ns-1382.awsdns-44.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0