Apex domains cannot have CNAME records.
Question and response
Question
dig keylesstransmitter.com. NS
Answer
keylesstransmitter.com. 5 NS ns-518.awsdns-00.net.
keylesstransmitter.com. 5 NS ns-1733.awsdns-24.co.uk.
keylesstransmitter.com. 5 NS ns-79.awsdns-09.com.
keylesstransmitter.com. 5 NS ns-1077.awsdns-06.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0