Join request but not accepted

This is driving me crazy, this is the Network server log. Everything seems to be ok, doesn’t it?

mar 01 15:18:31 raspberrypi chirpstack-network-server[27822]: time="2021-03-01T15:18:31+01:00" level=info msg="gateway/mqtt: uplink frame received" gateway_id=*XXXXXXXXXXXXXX* uplink_id=5b93d64a-9459-4d73-8cbb-88807065b30b
mar 01 15:18:32 raspberrypi chirpstack-network-server[27822]: time="2021-03-01T15:18:32+01:00" level=info msg="uplink: frame(s) collected" ctx_id=16bcb5de-8a67-4530-8465-bfa5948299dc mtype=JoinRequest uplink_ids="[5b93d64a-9459-4d73-8cbb-88807065b30b]"
mar 01 15:18:32 raspberrypi chirpstack-network-server[27822]: time="2021-03-01T15:18:32+01:00" level=info msg="lorawan/backend: finished backend api call" message_type=JoinReq protocol_version=1.0 receiver_id=70b3d57ed0036ca9 result_code=Success sender_id=000000 transaction_id=3972408433
mar 01 15:18:32 raspberrypi chirpstack-network-server[27822]: time="2021-03-01T15:18:32+01:00" level=info msg="sent uplink meta-data to network-controller" ctx_id=16bcb5de-8a67-4530-8465-bfa5948299dc dev_eui=*XXXXXXXXXXXXXX*
mar 01 15:18:32 raspberrypi chirpstack-network-server[27822]: time="2021-03-01T15:18:32+01:00" level=info msg="device-queue flushed" ctx_id=16bcb5de-8a67-4530-8465-bfa5948299dc dev_eui=*XXXXXXXXXXXXXX*
mar 01 15:18:32 raspberrypi chirpstack-network-server[27822]: time="2021-03-01T15:18:32+01:00" level=info msg="device-session saved" ctx_id=16bcb5de-8a67-4530-8465-bfa5948299dc dev_addr=012e5ff9 dev_eui=*XXXXXXXXXXXXXX*
mar 01 15:18:32 raspberrypi chirpstack-network-server[27822]: time="2021-03-01T15:18:32+01:00" level=info msg="device-activation created" ctx_id=16bcb5de-8a67-4530-8465-bfa5948299dc dev_eui=*XXXXXXXXXXXXXX* id=1869
mar 01 15:18:32 raspberrypi chirpstack-network-server[27822]: time="2021-03-01T15:18:32+01:00" level=info msg="device updated" ctx_id=16bcb5de-8a67-4530-8465-bfa5948299dc dev_eui=*XXXXXXXXXXXXXX*
mar 01 15:18:32 raspberrypi chirpstack-network-server[27822]: time="2021-03-01T15:18:32+01:00" level=info msg="gateway/mqtt: publishing gateway command" command=down downlink_id=16bcb5de-8a67-4530-8465-bfa5948299dc gateway_id=*XXXXXXXXXXXXXX* qos=0 topic=gateway/*XXXXXXXXXXXXXX*/command/down
mar 01 15:18:32 raspberrypi chirpstack-network-server[27822]: time="2021-03-01T15:18:32+01:00" level=info msg="storage: downlink-frame saved" ctx_id=16bcb5de-8a67-4530-8465-bfa5948299dc token=32468
mar 01 15:18:32 raspberrypi chirpstack-network-server[27822]: time="2021-03-01T15:18:32+01:00" level=info msg="backend/gateway: downlink tx acknowledgement received" downlink_id=16bcb5de-8a67-4530-8465-bfa5948299dc gateway_id=*XXXXXXXXXXXXXX*

What else should i look for? Unfortunately my gateway is not a “DIY” one but a commercial solution that should allow me to use it with chirpstack, with these configurations: