mx22.pr3.keysurvey.com has no NS records.
NS records for this zone are defined at keysurvey.com.
NS records for this zone are defined at keysurvey.com.
Question and response
Question
dig mx22.pr3.keysurvey.com. NS
Answer
The response has no answer records.
Authority
keysurvey.com. 300 SOA ns-cloud-d1.googledomains.com. cloud-dns-hostmaster.google.com. 1 21600 3600 259200 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0