ns4.workforcesoftware.com has no CNAME records.
Question and response
Question
dig ns4.workforcesoftware.com. NS
Answer
The response has no answer records.
Authority
workforcesoftware.com. 155 SOA ns10.digicertdns.com. dns.digicertdns.com. 2009013474 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0