Apex domains cannot have CNAME records.
Question and response
Question
dig kueppers.digital. NS
Answer
kueppers.digital. 5 NS ns-927.awsdns-51.net.
kueppers.digital. 5 NS ns-1751.awsdns-26.co.uk.
kueppers.digital. 5 NS ns-1339.awsdns-39.org.
kueppers.digital. 5 NS ns-1900.awsdns-45.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0