Apex domains cannot have CNAME records.
Question and response
Question
dig jola.net. NS
Answer
jola.net. 3 NS ns-1341.awsdns-39.org.
jola.net. 3 NS ns-1749.awsdns-26.co.uk.
jola.net. 3 NS ns-166.awsdns-20.com.
jola.net. 3 NS ns-797.awsdns-35.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0