Your ejabberd XMPP server is a powerful piece of software. But configuring everything requires several steps. Your best place to start is this hands-on ejabberd installation tutorial and this ejabberd STUN/TURN tutorial. If you have specific questions, first be sure to consult the official ejabberd documentation.
In case you were wondering, all ProcessOne services and operations are continuing as usual throughout COVID-19 outbreak. For more than a decade ProcessOne has been providing realtime messaging & communication services while its team was working 100% remotely, from various global locations. We continue to do so today without interruptions.