Issue Changing ble_app_uart to Coded PHY

Hello,

I am using the ble_advertising module in sdk 17.0.2 on an nRF52840 with softdevice 140.  I have the application working but want to convert to using coded PHY.  After reading over this post (https://devzone.nordicsemi.com/f/nordic-q-a/40476/unable-to-convert-to-long-range-after-looking-at-umpteen-examples--) it seemed that the only changes I would have to make would be in my advertising_init function.  Originally it was:

static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advertising_init_t init;

    memset(&init, 0, sizeof(init));

    init.advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance = false;
    init.advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

    init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.srdata.uuids_complete.p_uuids  = m_adv_uuids;

    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;
    init.evt_handler = on_adv_evt;

    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}

And I added these lines at the end to change to coded PHY so that the function is now: 

static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advertising_init_t init;

    memset(&init, 0, sizeof(init));

    init.advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance = false;
    init.advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

    init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.srdata.uuids_complete.p_uuids  = m_adv_uuids;


    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;
    init.evt_handler = on_adv_evt;
    
     //added to set phy to coded
    init.config.ble_adv_primary_phy       = BLE_GAP_PHY_CODED;  // use Coded PHY
    init.config.ble_adv_secondary_phy     = BLE_GAP_PHY_CODED;
    init.config.ble_adv_extended_enabled  = true;               // Coded PHY needs extended adv (bigger adv packet size)


    err_code = ble_advertising_init(&m_advertising, &init);
    APP_ERROR_CHECK(err_code);

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}

I don't get any errors compiling but I can't detect any advertising devices on the nRF Toolbox app on my phone so I'm not sure what's going wrong.  Are there other changes I need to make to implement the coded PHY, or have I implemented these changes incorrectly?

Also are there any changes to the config file that I need to make?

Thanks for the help,

Jake