mta1.sensorpro.app has no CNAME records.
Question and response
Question
dig mta1.sensorpro.app. NS
Answer
The response has no answer records.
Authority
sensorpro.app. 1658 SOA suzanne.ns.cloudflare.com. dns.cloudflare.com. 2396931607 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0