Apex domains cannot have CNAME records.
Question and response
Question
dig avolio.tech. NS
Answer
avolio.tech. 4 NS ns-1802.awsdns-33.co.uk.
avolio.tech. 4 NS ns-794.awsdns-35.net.
avolio.tech. 4 NS ns-162.awsdns-20.com.
avolio.tech. 4 NS ns-1399.awsdns-46.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0