_validation-contactemail.priotas.com has no CNAME records.
Question and response
Question
dig _validation-contactemail.priotas.com. NS
Answer
The response has no answer records.
Authority
priotas.com. 2621 SOA rc78.3uu.net. hostmaster.3uu.net.priotas.com. 2025123111 3600 3600 3600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0