Apex domains cannot have CNAME records.
Question and response
Question
dig mijndomeinhosting.nl. NS
Answer
mijndomeinhosting.nl. 4 NS ns-738.awsdns-28.net.
mijndomeinhosting.nl. 4 NS ns-1878.awsdns-42.co.uk.
mijndomeinhosting.nl. 4 NS ns-400.awsdns-50.com.
mijndomeinhosting.nl. 4 NS ns-1293.awsdns-33.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0