Apex domains cannot have CNAME records.
Question and response
Question
dig beyonddex-sg.com. NS
Answer
beyonddex-sg.com. 5 NS ns2.beyonddex-sg.com.
beyonddex-sg.com. 5 NS ns1.beyonddex-sg.com.
Authority
The response has no authority records.
Additional
ns1.beyonddex-sg.com. 5 A 51.161.68.211
ns2.beyonddex-sg.com. 5 A 51.77.104.24
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0