Apex domains cannot have CNAME records.
Question and response
Question
dig safehealthinc.org. NS
Answer
safehealthinc.org. 5 NS ns-1557.awsdns-02.co.uk.
safehealthinc.org. 5 NS ns-1926.awsdns-48.co.uk.
safehealthinc.org. 5 NS ns-1966.awsdns-53.co.uk.
safehealthinc.org. 5 NS ns-689.awsdns-22.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0