Apex domains cannot have CNAME records.
Question and response
Question
dig amedpsych.com. NS
Answer
amedpsych.com. 5 NS ns-1917.awsdns-47.co.uk.
amedpsych.com. 5 NS ns-1208.awsdns-23.org.
amedpsych.com. 5 NS ns-641.awsdns-16.net.
amedpsych.com. 5 NS ns-1814.awsdns-34.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0