Apex domains cannot have CNAME records.
Question and response
Question
dig supportows.org. NS
Answer
supportows.org. 3 NS ns-1735.awsdns-24.co.uk.
supportows.org. 3 NS ns-1457.awsdns-54.org.
supportows.org. 3 NS ns-399.awsdns-49.com.
supportows.org. 3 NS ns-872.awsdns-45.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0