Apex domains cannot have CNAME records.
Question and response
Question
dig ml.ee. NS
Answer
ml.ee. 4 NS ns.elion.ee.
ml.ee. 4 NS ns2.elion.ee.
Authority
The response has no authority records.
Additional
ns.elion.ee. 4 A 213.168.18.146
ns2.elion.ee. 4 A 195.50.193.163
ns.elion.ee. 4 AAAA 2001:7d0:1:1:0:0:0:2
ns2.elion.ee. 4 AAAA 2001:7d0:1:1:0:0:0:3
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0