Apex domains cannot have CNAME records.
Question and response
Question
dig bjcservice.com. NS
Answer
bjcservice.com. 5 NS ns-1135.awsdns-13.org.
bjcservice.com. 5 NS ns-1873.awsdns-42.co.uk.
bjcservice.com. 5 NS ns-1953.awsdns-52.co.uk.
bjcservice.com. 5 NS ns-771.awsdns-32.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0