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I can't recive the RX2 packet

Hi I would be grateful if someone could help me out with this one

I'm successfully reciving the RX1 frame but I never recive something on RX2

After sending a confirmed uplink the console on my gateway shows me, that it would send gs.down.send

      "rx1_delay": 1,
      "rx1_data_rate": {
        "lora": {
          "bandwidth": 125000,
          "spreading_factor": 7
        }
      },
      "rx1_frequency": "868100000",
      "rx2_data_rate": {
        "lora": {
          "bandwidth": 125000,
          "spreading_factor": 12
        }
      },
      "rx2_frequency": "869525000",
      "priority": "HIGHEST",
      "frequency_plan_id": "EU_863_870_TTN"

I'm still not able to recive anything with a different device listening continously using this settings:

  if (!LoRa.begin(869525000))
  {
    Serial.println("LoRa init failed. Check your connections.");
    while (true)
      ; // if failed, do nothing
  }
  LoRa.setPreambleLength(8);
  LoRa.setSyncWord(0x34);
  LoRa.disableCrc();
  LoRa.setCodingRate4(5);
  LoRa.setSpreadingFactor(12);
  LoRa.enableInvertIQ();
  LoRa.setSignalBandwidth(125E3);

Setting this to frequency 868100000 and SF 7 is working with the RX1 packet so I know the code is working

In the General settings tab on the device I selected the Frequency plan Europe 863-870 MHz (SF9 for RX2 - recommended),
LoRaWAN version MAC V1.0.4 and Regional Parameters version PHY V1.0

Can someone give me a hint of what I'm missing ;)

Thanks in advance

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