ChirpStack system can't see my device

My LoRaWAN Distance Detection Sensor Dragino LDDS75 V1.0.3 with TTN cloud works fine, but ChirpStack not detecting device. This system I installed on my gateway Raspberry PI RAK7243, and ChirpStask gateway detected fine. I tested entering OTAA method and Dev EUI with both methods MSB and LSB.
When I look at loraserver_as database via PgAdmin I see, that my entered APP_KEY is filled with zeroes,
NWK_KEY is filled with my entered via web app_key, it is correct?
I can’t see where I can enter Join EUI, it is not required for OTAA?
The Join EUI field is only in loraserver_ns database device_activation table.
How I can debug log gateway, it is receiving something from device?

I via serial port ATZ restarted MCU, deactivated device, now ChirpStack device found, but device joining infinity times. What could be the solution to this problem?

Connecting a device - ChirpStack open-source LoRaWAN<sup>®</sup> Network Server contains some steps for debugging which might be helpful.

Thank you for answer, then after a certain period of time device successfully joined.