Apex domains cannot have CNAME records.
Question and response
Question
dig tppwholesale.com.au. NS
Answer
tppwholesale.com.au. 5 NS ns-363.awsdns-45.com.
tppwholesale.com.au. 5 NS ns-1835.awsdns-37.co.uk.
tppwholesale.com.au. 5 NS ns-1266.awsdns-30.org.
tppwholesale.com.au. 5 NS ns-759.awsdns-30.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0