Problem in recieve of RXDone

Hi Brokaar
I have some problems about recieving of RXDone.
We use lora server, we registerd our gateway in lora server. we made our node by sx1272. when we send JoinRequest to gateway, we see that JoinRequest resieved by lora server and it send JoinAccept, But our node can not accept Joine accept and it send RxTimeout instead of RxDone, I can’t underestand why. please help me about this problem.