End device can not join a network

Hi All,

I have two XB3-24 devices configured as Zigbee Coordinator API and Zigbee End Device API.
End device can’t join coordinator’s network. Security is disabled on both (EE = 0 and KY = 0).
Coordinator’s NC = 13
End device Operating network parameters return:
AI = 0x24 or 0x27
OP = 0
CH = 0

When switching to Router, it gets associated.
I need your help please.
Thanks in advance.

Sounds like Joining is disabled or something. What firmware version are you working with?