Apex domains cannot have CNAME records.
Question and response
Question
dig upsndownsmoonbounce.com. NS
Answer
upsndownsmoonbounce.com. 5 NS ns-1999.awsdns-57.co.uk.
upsndownsmoonbounce.com. 5 NS ns-1095.awsdns-08.org.
upsndownsmoonbounce.com. 5 NS ns-1716.awsdns-22.co.uk.
upsndownsmoonbounce.com. 5 NS ns-1786.awsdns-31.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0