Apex domains cannot have CNAME records.
Question and response
Question
dig jelastic.dogado.eu. NS
Answer
jelastic.dogado.eu. 5 NS ns249.jelastic.dogado.eu.
jelastic.dogado.eu. 5 NS ns250.jelastic.dogado.eu.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0