Downlink message enqueued but not sent

I am trying to use the ChirpStack UI (Applications / Devices) to send a downlink message to a specific Class A device. The message is enqueued but never sent. I do receive uplink messages (they can be seen under the “Device data” and “Lorawan frames” tabs) but the server never initiates the downlink message. Can someone explain what am I doing wrong? I am trying to send a simple message (0x5A in hex → Wg== in Base64) to port 200 of the device.

Just in case someone reads my post.
My problem was generated by the fact that the gateway is connected through a 3G mobile network. Restarting the gateway (a Kerlink Wirnet) solved the problem.

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In that case, ChirpStack probably did try to send it to the gateway, but as no (tx) acknowledgement was received from the gateway, it stayed in the queue.

Yes, that was the case. Sorry for the late reply!