Apex domains cannot have CNAME records.
Question and response
Question
dig amabis.com. NS
Answer
amabis.com. 5 NS ns1.amabis.com.
amabis.com. 5 NS ns2.amabis.com.
amabis.com. 5 NS nssec.online.net.
Authority
The response has no authority records.
Additional
ns1.amabis.com. 5 A 212.83.130.138
ns2.amabis.com. 5 A 178.32.156.48
ns1.amabis.com. 5 AAAA 2001:bc8:3f0a:401:0:0:0:1
ns2.amabis.com. 5 AAAA 2001:41d0:203:7da0:0:0:0:0
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0