Apex domains cannot have CNAME records.
Question and response
Question
dig interaktiv-media.se. NS
Answer
interaktiv-media.se. 5 NS ns1.interaktiv-media.se.
interaktiv-media.se. 5 NS dns2.tankbar.com.
Authority
The response has no authority records.
Additional
ns1.interaktiv-media.se. 5 A 195.67.74.129
dns2.tankbar.com. 5 A 51.12.242.14
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0