Thank you Justin for responding. I checked the krb5.conf and it was not configured for
'dns_lookup_kdc = true'. I added it in. I restarted sssd service but still no
change. Also along the way during this troubleshooting I have no broken the
authentication to the parent domain and am now getting the following error in the
krb5_child.log.
Received error from KDC: -1765328360/Preauthentication failed