Apex domains cannot have CNAME records.
Question and response
Question
dig bepanthen-sampling.com. NS
Answer
bepanthen-sampling.com. 4 NS ns-1720.awsdns-23.co.uk.
bepanthen-sampling.com. 4 NS ns-1225.awsdns-25.org.
bepanthen-sampling.com. 4 NS ns-1483.awsdns-57.org.
bepanthen-sampling.com. 4 NS ns-1958.awsdns-52.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0