Apex domains cannot have CNAME records.
Question and response
Question
dig oxalide.net. NS
Answer
oxalide.net. 5 NS ns-1002.awsdns-61.net.
oxalide.net. 5 NS ns-76.awsdns-09.com.
oxalide.net. 5 NS ns-1864.awsdns-41.co.uk.
oxalide.net. 5 NS ns-1232.awsdns-26.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0