Apex domains cannot have CNAME records.
Question and response
Question
dig 1800taxinow.com. NS
Answer
1800taxinow.com. 4 NS ns-1834.awsdns-37.co.uk.
1800taxinow.com. 4 NS ns-41.awsdns-05.com.
1800taxinow.com. 4 NS ns-300.awsdns-37.com.
1800taxinow.com. 4 NS ns-845.awsdns-41.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0