Apex domains cannot have CNAME records.
Question and response
Question
dig dixa.io. NS
Answer
dixa.io. 4 NS ns-356.awsdns-44.com.
dixa.io. 4 NS ns-1476.awsdns-56.org.
dixa.io. 4 NS ns-669.awsdns-19.net.
dixa.io. 4 NS ns-1575.awsdns-04.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0