Apex domains cannot have CNAME records.
Question and response
Question
dig ionimyquiz.com. NS
Answer
ionimyquiz.com. 5 NS ns-3.awsdns-00.com.
ionimyquiz.com. 5 NS ns-87.awsdns-10.com.
ionimyquiz.com. 5 NS ns-916.awsdns-50.net.
ionimyquiz.com. 5 NS ns-1214.awsdns-23.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0