application device not receiving

[Liam_Philipp]

As AS923 has only 2 channels enabled by default as per LoRaWAN regional parameters, you must enable the channels you are using yourself

AS923 default frequencies

You have to configure the additional [[network_server.network_settings.extra_channels]]. Then the ChirpStack Network Server will either send these as CFList or as mac-commands after an OTAA join.