You need to enable it manually.
Create a template-custom
mkdir /etc/e-smith/templates-custom/etc/ejabberd/ejabberd.cfg/
Put this content inside /etc/e-smith/templates-custom/etc/ejabberd/ejabberd.cfg/80Ports20s2S
,{5269, ejabberd_s2s_in, [{shaper, s2s_shaper}, {max_stanza_size, 131072}]}
Open the port inside the firewall:
config setprop ejabberd TCPPorts 5222,5223,5280,5269
Apply the configuration:
signal-event ejabberd-update
signal-event firewall-adjust
If something doesn’t work as expected, check the syntax of generated ejabberd configuration file.