Apex domains cannot have CNAME records.
Question and response
Question
dig basis-technology.com. NS
Answer
basis-technology.com. 2 NS ns-1932.awsdns-49.co.uk.
basis-technology.com. 2 NS ns-609.awsdns-12.net.
basis-technology.com. 2 NS ns-1585.awsdns-06.co.uk.
basis-technology.com. 2 NS ns-1605.awsdns-08.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0