Apex domains cannot have CNAME records.
Question and response
Question
dig uk.4me.com. NS
Answer
uk.4me.com. 5 NS ns-1558.awsdns-02.co.uk.
uk.4me.com. 5 NS ns-1246.awsdns-27.org.
uk.4me.com. 5 NS ns-372.awsdns-46.com.
uk.4me.com. 5 NS ns-1003.awsdns-61.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0