Apex domains cannot have CNAME records.
Question and response
Question
dig psa-services.net. NS
Answer
psa-services.net. 5 NS ns-533.awsdns-02.net.
psa-services.net. 5 NS ns-1814.awsdns-34.co.uk.
psa-services.net. 5 NS ns-315.awsdns-39.com.
psa-services.net. 5 NS ns-1519.awsdns-61.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0