Apex domains cannot have CNAME records.
Question and response
Question
dig novaltrix.org. NS
Answer
novaltrix.org. 2 NS ns-1865.awsdns-41.co.uk.
novaltrix.org. 2 NS ns-91.awsdns-11.com.
novaltrix.org. 2 NS ns-1535.awsdns-63.org.
novaltrix.org. 2 NS ns-1628.awsdns-11.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0