Apex domains cannot have CNAME records.
Question and response
Question
dig sidekickicon.com. NS
Answer
sidekickicon.com. 3 NS ns-4.awsdns-00.com.
sidekickicon.com. 3 NS ns-1576.awsdns-05.co.uk.
sidekickicon.com. 3 NS ns-1322.awsdns-37.org.
sidekickicon.com. 3 NS ns-942.awsdns-53.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0