Apex domains cannot have CNAME records.
Question and response
Question
dig fiberfly.com. NS
Answer
fiberfly.com. 4 NS ns-699.awsdns-23.net.
fiberfly.com. 4 NS ns-112.awsdns-14.com.
fiberfly.com. 4 NS ns-1634.awsdns-12.co.uk.
fiberfly.com. 4 NS ns-1378.awsdns-44.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0