Apex domains cannot have CNAME records.
Question and response
Question
dig brbild.se. NS
Answer
brbild.se. 5 NS ns64.domaincontrol.com.
brbild.se. 5 NS ns63.domaincontrol.com.
Authority
The response has no authority records.
Additional
ns63.domaincontrol.com. 3 A 97.74.101.42
ns64.domaincontrol.com. 3 A 173.201.69.42
ns63.domaincontrol.com. 3 AAAA 2603:5:2154:0:0:0:0:2a
ns64.domaincontrol.com. 3 AAAA 2603:5:2254:0:0:0:0:2a
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0