Apex domains cannot have CNAME records.
Question and response
Question
dig produce.eu.com. NS
Answer
produce.eu.com. 5 NS athena.ns.cloudflare.com.
produce.eu.com. 5 NS pete.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0