Apex domains cannot have CNAME records.
Question and response
Question
dig saint-ceran.com. NS
Answer
saint-ceran.com. 2 NS ns-1813.awsdns-34.co.uk.
saint-ceran.com. 2 NS ns-2020.awsdns-60.co.uk.
saint-ceran.com. 2 NS ns-396.awsdns-49.com.
saint-ceran.com. 2 NS ns-427.awsdns-53.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0