Unable to start sssd as a service?

[onetech-it]

I have recently added a CentOS 7 host to my Windows 2016 Active Directory using the sssd 'realm add' method, but I am unable to restart the sssd service. When I attempt to I receive the following error:

[root@server01~]# systemctl status sssd -l
● sssd.service - System Security Services Daemon
Loaded: loaded (/usr/lib/systemd/system/sssd.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/sssd.service.d
└─journal.conf
Active: failed (Result: exit-code) since Tue 2017-12-12 10:03:52 PST; 2min 7s ago
Process: 8335 ExecStart=/usr/sbin/sssd -i -f (code=exited, status=4)
Main PID: 8335 (code=exited, status=4)

Dec 12 10:03:52 server01 systemd[1]: Starting System Security Services Daemon...
Dec 12 10:03:52 server01 sssd[8335]: SSSD couldn't load the configuration database [2]: No such file or directory.
Dec 12 10:03:52 server01 systemd[1]: sssd.service: main process exited, code=exited, status=4/NOPERMISSION
Dec 12 10:03:52 server01 systemd[1]: Failed to start System Security Services Daemon.
Dec 12 10:03:52 server01 systemd[1]: Unit sssd.service entered failed state.
Dec 12 10:03:52 server01 systemd[1]: sssd.service failed.
[root@server01 ~]#

What should I be doing to enable sssd as a service?