Chirpstack sends data, but the device cannot receive it

My chirpstack server can already receive uplink data, but I have a problem with downlink transmission through enqueue downlink payload. I have created a downlink queue, but there is no response from the device. I don’t know whether it is the problem of the server or the problem of the gateway device. Can you help me

How long your downlink was? What region did you use?

EU868 frequency 0 channel used

This is the gateway I use

This is the device I use

I suspect it is the gateway configuration problem. Do you know how to configure the gateway

Sry, I personally never use 1 channel kind of gateway. I usually use 8 channels gateway on AS923, mostly SX1301 based gateway

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