I Cube LRWAN problem

Hello, I am currently working on a project using LoRa technology. My end node is composed of Nucleo-l073rz and i-Nucleo-lrwan1 shield and I am also using Keil IDE. So here’s the problem:

1. I installed the I Cube Lrwan expansion ( I tried both V1.3.1 and the latest one which is the V2.0.0 and even older versions)
2. I made the changes in the code as instructed (Older version : Changes in the commissioning.h file: DevEUI, JoinEUI, NwkKey, *Latest Version * : Changes in the se-identity.h file: DevEUI, JoinEUI, NwkKey)
3. I built and loaded the code
4. I used Tera term on my COM to monitor the join request
5. In both cases ( for the 2 versions) I got nothing.
   5.1 for the V1.3.1 version (and all the older versions like v1.1.1, v1.2.2 v1.4.1 …): I get Phy TxTimeout and nothing else (I monitor the traffic on the gateway and I get nothing )
   5.2 for the V2.0.0 version: I keep getting Join Failed every 10 s
   So I am asking for a solution to this problem and Thank you in advance