Apex domains cannot have CNAME records.
Question and response
Question
dig cerveloup.com. NS
Answer
cerveloup.com. 5 NS ns-1406.awsdns-47.org.
cerveloup.com. 5 NS ns-434.awsdns-54.com.
cerveloup.com. 5 NS ns-1954.awsdns-52.co.uk.
cerveloup.com. 5 NS ns-1918.awsdns-47.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0