Apex domains cannot have CNAME records.
Question and response
Question
dig dnsfactory.dk. NS
Answer
dnsfactory.dk. 1 NS ns2.wannafind.dk.
dnsfactory.dk. 1 NS ns1.wannafind.dk.
Authority
The response has no authority records.
Additional
ns2.wannafind.dk. 1 A 91.197.248.69
ns2.wannafind.dk. 1 AAAA 2a02:2339:1:104:0:0:daba:daa
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0