Apex domains cannot have CNAME records.
Question and response
Question
dig agrenshuset.com. NS
Answer
agrenshuset.com. 5 NS ns2.agrenshuset.com.
agrenshuset.com. 5 NS ns1.agrenshuset.com.
Authority
The response has no authority records.
Additional
ns1.agrenshuset.com. 5 A 157.254.12.224
ns2.agrenshuset.com. 5 A 195.3.221.141
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0