Apex domains cannot have CNAME records.
Question and response
Question
dig bedm.email. NS
Answer
bedm.email. 2 NS ns-1625.awsdns-11.co.uk.
bedm.email. 2 NS ns-232.awsdns-29.com.
bedm.email. 2 NS ns-852.awsdns-42.net.
bedm.email. 2 NS ns-1096.awsdns-09.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0