I got a chance to try this again with the same result. To test, I uninstalled the plugin and deleted its appdata folder. I then reinstalled the plugin and, per your suggestion, used the default settings (with the exception of specifying the Dynamic DNS address). I still see results like so in the openvpn server log:
Thu Jan 25 01:16:05 2018 192.168.86.1:43312 TLS: Initial packet from [AF_INET]192.168.86.1:43312, sid=0773056c 1556308b
Thu Jan 25 01:17:05 2018 192.168.86.1:43312 TLS Error: TLS key negotiation failed to occur within 60 seconds (check your network co$
Thu Jan 25 01:17:05 2018 192.168.86.1:43312 TLS Error: TLS handshake failed
Thu Jan 25 01:17:05 2018 192.168.86.1:43312 SIGUSR1[soft,tls-error] received, client-instance restarting
On log page in bottom red text, I see br0 as the network interface (see screenshot). However, if I look at unRAID System Info, it appears to show bond0 (see screenshot). I'm unsure how to proceed.