Apex domains cannot have CNAME records.
Question and response
Question
dig accountis.net. NS
Answer
accountis.net. 5 NS internal-ns-extb-1.accountis.net.
accountis.net. 5 NS internal-ns-exta-1.accountis.net.
Authority
The response has no authority records.
Additional
internal-ns-exta-1.accountis.net. 5 A 85.90.252.10
internal-ns-extb-1.accountis.net. 5 A 83.166.167.131
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0