OpenVPN Server Not Starting

I have followed the tutorial at https://www.digitalocean.com/community/tutorials/how-to-set-up-and-configure-an-openvpn-server-on-ubuntu-20-04 but when I get to the bottom of Chapter 10, my server is not running. Any suggestions. Server status is below.

dave@ubuntu-1gb-lon1-01:~$ sudo systemctl start openvpn-server@server.service
dave@ubuntu-1gb-lon1-01:~$ sudo systemctl status openvpn-server@server.service
● openvpn-server@server.service - OpenVPN service for server
     Loaded: loaded (/lib/systemd/system/openvpn-server@.service; enabled; vendor preset: enabled)
     Active: activating (auto-restart) (Result: exit-code) since Fri 2021-01-29 11:25:46 GMT; 1s ago
       Docs: man:openvpn(8)
             https://community.openvpn.net/openvpn/wiki/Openvpn24ManPage
             https://community.openvpn.net/openvpn/wiki/HOWTO
    Process: 3521 ExecStart=/usr/sbin/openvpn --status /run/openvpn-server/status-server.log --status-version 2 --suppress-timestamps --config server.conf (code=exited, status=1/FAILURE)
   Main PID: 3521 (code=exited, status=1/FAILURE)
     Status: "Pre-connection initialization successful"

Jan 29 11:25:46 ubuntu-1gb-lon1-01 systemd[1]: openvpn-server@server.service: Main process exited, code=exited, status=1/FAILURE
Jan 29 11:25:46 ubuntu-1gb-lon1-01 systemd[1]: openvpn-server@server.service: Failed with result 'exit-code'.
dave@ubuntu-1gb-lon1-01:~$

Are there any logs files that I can send to assist in resolving this issue?

I have rebooted the droplet and also gone over the instructions with a fine tooth comb. I did omit most of the options marked as ‘optional’ in the tutorial.