Apex domains cannot have CNAME records.
Question and response
Question
dig trovalin.com. NS
Answer
trovalin.com. 5 NS ns-612.awsdns-12.net.
trovalin.com. 5 NS ns-199.awsdns-24.com.
trovalin.com. 5 NS ns-108.awsdns-13.com.
trovalin.com. 5 NS ns-1601.awsdns-08.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0