Downlink is not queued for class A device transmission

I’m a beginner to chirpstack.
I’m trying to send a firming from the chirpstack server to the node. With Class C i was able to recieve the data and ack to be true.
But when i run the device in class A and disabling the class B and class C in chirpstack, the downlink msg is sent soon after (1-2 sec) enqueuing the msg.
Also the msg is not being recieved at node.
What can be the issue?
Thanks in advance.

I had a similar problem, check your device profile and turn off Class C

You might also need to re-activate your device for the setting to propagate.

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