Apex domains cannot have CNAME records.
Question and response
Question
dig innovasur.es. NS
Answer
innovasur.es. 5 NS dominios.innovasur.es.
innovasur.es. 5 NS dominios.innovasur.com.
innovasur.es. 5 NS dominiostres.innovasur.com.
Authority
The response has no authority records.
Additional
dominios.innovasur.es. 2 A 46.39.192.80
dominios.innovasur.com. 5 A 46.39.192.80
dominiostres.innovasur.com. 5 A 46.39.192.68
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0