Apex domains cannot have CNAME records.
Question and response
Question
dig danstaxservice.com. NS
Answer
danstaxservice.com. 5 NS ns-1875.awsdns-42.co.uk.
danstaxservice.com. 5 NS ns-1236.awsdns-26.org.
danstaxservice.com. 5 NS ns-1589.awsdns-06.co.uk.
danstaxservice.com. 5 NS ns-1854.awsdns-39.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0