Apex domains cannot have CNAME records.
Question and response
Question
dig postkodlotteriet.se. NS
Answer
postkodlotteriet.se. 5 NS ns-1874.awsdns-42.co.uk.
postkodlotteriet.se. 5 NS ns-1423.awsdns-49.org.
postkodlotteriet.se. 5 NS ns-288.awsdns-36.com.
postkodlotteriet.se. 5 NS ns-716.awsdns-25.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0