Apex domains cannot have CNAME records.
Question and response
Question
dig planethollywoodresortcasino.com. NS
Answer
planethollywoodresortcasino.com. 5 NS ns-1730.awsdns-24.co.uk.
planethollywoodresortcasino.com. 5 NS ns-1306.awsdns-35.org.
planethollywoodresortcasino.com. 5 NS ns-1456.awsdns-54.org.
planethollywoodresortcasino.com. 5 NS ns-1640.awsdns-13.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0