Apex domains cannot have CNAME records.
Question and response
Question
dig medievalgamesonline.com. NS
Answer
medievalgamesonline.com. 2 NS ns-1197.awsdns-21.org.
medievalgamesonline.com. 2 NS ns-1736.awsdns-25.co.uk.
medievalgamesonline.com. 2 NS ns-447.awsdns-55.com.
medievalgamesonline.com. 2 NS ns-1630.awsdns-11.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0