Apex domains cannot have CNAME records.
Question and response
Question
dig prosodie.com. NS
Answer
prosodie.com. 5 NS ns-1564.awsdns-03.co.uk.
prosodie.com. 5 NS ns-1109.awsdns-10.org.
prosodie.com. 5 NS ns-403.awsdns-50.com.
prosodie.com. 5 NS ns-607.awsdns-11.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0