we have to tried to joined two zigbee device [Coordinator and End Device] but after device announce coordinator send device leave request to end device.
Please find the attached sniffer logs.
YK is on to something here. From the log, I see that the end device sends an unencrypted device announce before ever waiting for the "Transport network key" message from the trust center. Please let us know what security you're running on your TC as well as the Ember ZNet stack versions on both devices.