No device found with bt_le_scan_start and observer

Dear,

I am using nRF5340 and I am trying to scan devices around me. With the example observer my device founds other devices around me, but when I use the same configuration and the same functions into my project the device doesn't find anything. The code is the same, exactly the same but I can't see anything.

The prj.conf is

#Peripherals
CONFIG_GPIO=y
CONFIG_SPI=y

CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_MPU_ALLOW_FLASH_WRITE=y

CONFIG_PRINTK=y


# Bootloader
CONFIG_BOOTLOADER_MCUBOOT=y

# Bluetooth configuration
CONFIG_BT=y
#CONFIG_BT_PERIPHERAL=y
#CONFIG_BT_DEVICE_NAME="Test"
#CONFIG_BT_DEBUG_LOG=y
#CONFIG_BT_CENTRAL=y
#CONFIG_BT_SCAN=y
CONFIG_BT_OBSERVER=y

# Other 
CONFIG_MAIN_STACK_SIZE=2048

CONFIG_LOG=y

And the code is:

#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/hci.h>


#if (APP_DEBUG_ON == 1)
#include <zephyr/sys/printk.h>
#endif

#define DEVICE_NAME CONFIG_BT_DEVICE_NAME
#define DEVICE_NAME_LEN (sizeof(DEVICE_NAME) - 1)

static void deviceFound (const bt_addr_le_t *addr, 
                         int8_t rssi, 
                         uint8_t type,
                         struct net_buf_simple *buf)
{
    char dev[BT_ADDR_LE_STR_LEN];

    // if (type == BT_GAP_ADV_TYPE_ADV_SCAN_IND)
    // {
        bt_addr_le_to_str(addr, dev, sizeof(dev));
        printk("[DEVICE]: %s, AD evt type %u, AD data len %u, RSSI %i\n",dev, type, buf->len, rssi);
    // }


}

void Bluetooth_init (void)
{
    int err = 0;

    err = bt_enable(NULL);
    if (err) 
    {
#if (APP_DEBUG_ON == 1)
        printk("ERROR: Bluetooth init failed (err %d)\n", err);
#endif
        goto bluetooth_init_error;
    }

#if (APP_DEBUG_ON == 1)
    printk("BLUETOOTH0: Bluetooth initialized\n");
#endif

	struct bt_le_scan_param scanParam = 
    {
        .type       = BT_LE_SCAN_TYPE_PASSIVE,
        .options    = BT_LE_SCAN_OPT_FILTER_DUPLICATE,
        .interval   = BT_GAP_SCAN_FAST_INTERVAL,
        .window     = BT_GAP_SCAN_FAST_WINDOW,
    };

    err = bt_le_scan_start(&scanParam, deviceFound);
    if (err) 
    {
#if (APP_DEBUG_ON == 1)
        printk("ERROR: Scanning failed to start (err %d)\n", err);
#endif
        goto bluetooth_init_error;
    }
#if (APP_DEBUG_ON == 1)
    printk("BLUETOOTH0: Scanning successfully started\n");
#endif

bluetooth_init_error:
    if (err)
    {
        // TODO
    }
}

The output log is:

BLUETOOTH0: Bluetooth initialized
BLUETOOTH0: Scanning successfully started

Where is it the error? Haw can I debug this issue?

Thanks

Marco

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