Try some other client (Spark, Psi, Pidgin). Usually in jabber/xmpp one user has to approve another user's request to add him, before messaging can occur. You can also try creating a group, put those users in that group and then enable sharing of this group to All users (this will make them automatically subscribed to each other). Or you can use Subscription plugin for Openfire and set it to automatically accept subscription requests. Two last options are if you really want to use Oneteam client. Maybe it doesn't fully support some specs of xmpp and you don't get subscription requests.
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