Apex domains cannot have CNAME records.
Question and response
Question
dig telensia.net. NS
Answer
telensia.net. 2 NS ns2.telensia.net.
telensia.net. 2 NS ns1.telensia.net.
Authority
The response has no authority records.
Additional
ns1.telensia.net. 2 A 46.18.96.4
ns2.telensia.net. 2 A 46.18.98.4
ns1.telensia.net. 2 AAAA 2a02:2778:0:0:0:0:0:4
ns2.telensia.net. 2 AAAA 2a02:2778:200:0:0:0:0:4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0