Apex domains cannot have CNAME records.
Question and response
Question
dig opusinteractive.cloud. NS
Answer
opusinteractive.cloud. 4 NS ns1.opusinteractive.io.
opusinteractive.cloud. 4 NS ns3.opusinteractive.io.
opusinteractive.cloud. 4 NS ns2.opusinteractive.io.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0