spfa.microsoftonline.com has no NS records.
NS records for this zone are defined at microsoftonline.com.
NS records for this zone are defined at microsoftonline.com.
Question and response
Question
dig spfa.microsoftonline.com. NS
Answer
The response has no answer records.
Authority
microsoftonline.com. 60 SOA ns1-38.azure-dns.com. msnhst.microsoft.com. 2017971531 300 120 2419200 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0