Apex domains cannot have CNAME records.
Question and response
Question
dig covidjk.com. NS
Answer
covidjk.com. 5 NS ns-1615.awsdns-09.co.uk.
covidjk.com. 5 NS ns-1508.awsdns-60.org.
covidjk.com. 5 NS ns-254.awsdns-31.com.
covidjk.com. 5 NS ns-916.awsdns-50.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0