Apex domains cannot have CNAME records.
Question and response
Question
dig glamorous-h.com. NS
Answer
glamorous-h.com. 5 NS ns-1739.awsdns-25.co.uk.
glamorous-h.com. 5 NS ns-696.awsdns-23.net.
glamorous-h.com. 5 NS ns-953.awsdns-55.net.
glamorous-h.com. 5 NS ns-1513.awsdns-61.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0