xbee 2.5 series network

Hi everyone,

I want to make a XBee network with 3 XBee pro 2.5 Series. I can make two XBee modules work with programming one as coordinator and other one as end device.

When I try to program one as a coordinator and two remaining as end device then two end devices are not comunicating with eachother. They all have the same PAN ID and same channel configuration.

How shall I configure the modules so they all can talk to eachother.
I use X-CTU to program the modules.

Thanks for your help already.