Apex domains cannot have CNAME records.
Question and response
Question
dig mailprotect.org.uk. NS
Answer
mailprotect.org.uk. 5 NS dns7.qzxyz.com.
mailprotect.org.uk. 5 NS dns10.qzxyz.com.
mailprotect.org.uk. 5 NS dns8.qzxyz.com.
Authority
The response has no authority records.
Additional
dns7.qzxyz.com. 5 A 62.254.211.200
dns8.qzxyz.com. 5 A 185.246.132.142
dns10.qzxyz.com. 5 A 5.150.76.35
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0