mail.concursolutions.com has no NS records.
NS records for this zone are defined at concursolutions.com.
NS records for this zone are defined at concursolutions.com.
Question and response
Question
dig mail.concursolutions.com. NS
Answer
The response has no answer records.
Authority
concursolutions.com. 300 SOA ns0.concur.net. eoperator.concur.com. 2019082630 10800 3600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0