ooc-g2.tm-4.office.com has no NS records.
NS records for this zone are defined at tm-4.office.com.
NS records for this zone are defined at tm-4.office.com.
Question and response
Question
dig ooc-g2.tm-4.office.com. NS
Answer
ooc-g2.tm-4.office.com. 60 CNAME outlook.ms-acdc.office.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0