Apex domains cannot have CNAME records.
Question and response
Question
dig ymylholster.com. NS
Answer
ymylholster.com. 4 NS ns-1851.awsdns-39.co.uk.
ymylholster.com. 4 NS ns-46.awsdns-05.com.
ymylholster.com. 4 NS ns-254.awsdns-31.com.
ymylholster.com. 4 NS ns-1560.awsdns-03.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0