mta.wolterskluwercloud.com has no NS records.
NS records for this zone are defined at wolterskluwercloud.com.
NS records for this zone are defined at wolterskluwercloud.com.
Question and response
Question
dig mta.wolterskluwercloud.com. NS
Answer
The response has no answer records.
Authority
wolterskluwercloud.com. 300 SOA ns1-02.azure-dns.com. azuredns-hostmaster.microsoft.com. 1 3600 300 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0