LR1121 Network Access

I used two LR1121 chips and ESP32 to complete the single-channel HUB function. The other one referred to this example, but it could not access the network. The server I used was TTN. I tested it with 1303 (gateway) + 1262 (node), and it can allow 1262 to access the network normally.
Please tell me how to use LR1121 to access the network.
Thank you in advance for any suggestions!