Apex domains cannot have CNAME records.
Question and response
Question
dig opal-solutions.com. NS
Answer
opal-solutions.com. 5 NS dns03.opal-solutions.com.
opal-solutions.com. 5 NS dns01.opal-solutions.com.
opal-solutions.com. 5 NS dns02.opal-solutions.com.
Authority
The response has no authority records.
Additional
dns01.opal-solutions.com. 5 A 195.74.130.2
dns02.opal-solutions.com. 5 A 195.12.1.1
dns03.opal-solutions.com. 5 A 62.24.166.38
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0