Apex domains cannot have CNAME records.
Question and response
Question
dig aas.services. NS
Answer
aas.services. 4 NS ns-331.awsdns-41.com.
aas.services. 4 NS ns-1059.awsdns-04.org.
aas.services. 4 NS ns-969.awsdns-57.net.
aas.services. 4 NS ns-1806.awsdns-33.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0