Downlink data (confirmed and unconfirmed) doesn´t work

Setup and configuration
1

I have a sensor device connected to my ChirpStack and I want to send downlink data to that device. So I fill out the Enqueue downlink payload area

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and schedule the downlink.

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My device is sending some uplink data and they appear in the LORAWAN FRAMES´ window but as UnconfirmedDataDown`.

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Also, the LoRa module (RAK3172) doesn´t output received data. Why does ChirpStack output UnconfirmedDataDown when I have selected confirmed data? Do I have to change something in the configuration to use downlink in confirmed mode?

2

Figured out the problem in the documentation: Note: After a device (re)activation the device-queue is flushed.
I have started every transmission during the join cycle by using the web application and this discards the queue.