ITAssist2.sharepoint.com has no NS records.
NS records for this zone are defined at sharepoint.com.
NS records for this zone are defined at sharepoint.com.
Question and response
Question
dig dual-spo-0005.spo-msedge.net. NS
Answer
The response has no answer records.
Authority
spo-msedge.net. 240 SOA ns1.spo-msedge.net. msnhst.microsoft.com. 2018012401 1800 900 2419200 240
Additional
. 0 OPT ; payload 1224, xrcode 0, version 0, flags 0