Have just purchased BeejiveIM to see if I can get it to talk directly to the IM server within ZCS. Though so far I have not been able to get it to work

My domain is exposed via a SRV record which resolves fine. Within the settings I have set the username to be
uxbod@domain.com, host is set to my ZCS hostname and port 5269, and with TLS selected. Any ideas on how I can find out why it is failing to authenticate ?
Please note that I am able to connect with other XMPP accounts, and people can invite me aswell so that side of things appears okay.