Support distance measurement for long range

Question

Hi 
 I am working on a project which uses distance measurement config for multiple peripherals with long range. 
 Our plan is to support DM for up to range 25m and we observed disconnect issue at 5-10m range. We also tried PHY with LE-CODED enabled and if it is enabled, the DM will not work as we do not read any result at all. 
 May I know is DM supported with LE-CODED enabled, or do we need to config anything to do so. 
 
 We are using NRF Connect SDK V2.7.0 
 Let me insert out prj file for better reference 
 # CENTRAL
CONFIG_BT=y
CONFIG_BT_CENTRAL=y
CONFIG_BT_SCAN=y
CONFIG_BT_SCAN_FILTER_ENABLE=n
CONFIG_BT_MAX_CONN=5
# Allow to read RSSI for the connected peripheral
CONFIG_BT_CTLR=y
CONFIG_BT_CTLR_CONN_RSSI=y

# PERIPHERAL
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEVICE_NAME="Notify"
CONFIG_BT_PER_ADV=y
CONFIG_BT_SETTINGS=y
CONFIG_BT_GATT_CLIENT=y
CONFIG_BT_GATT_CACHING=n
CONFIG_BT_L2CAP_TX_MTU=252
CONFIG_BT_BUF_ACL_RX_SIZE=256
CONFIG_BT_PERIPHERAL_PREF_TIMEOUT=600
CONFIG_BT_PERIPHERAL_PREF_MIN_INT=120
CONFIG_BT_PERIPHERAL_PREF_MAX_INT=160
CONFIG_BT_PERIPHERAL_PREF_LATENCY=2
CONFIG_OPENTHREAD_DEFAULT_TX_POWER=8
CONFIG_BT_CTLR_TX_PWR_PLUS_8=y

# PHY Coded enable for long range
# CONFIG_BT_PHY_UPDATE=y
CONFIG_BT_CTLR_PHY_CODED=y
CONFIG_BT_USER_PHY_UPDATE=y
CONFIG_BT_CTLR_ADV_EXT=y
CONFIG_BT_EXT_ADV=y

# Distance Measurement
CONFIG_DM_MODULE=y
CONFIG_DM_GPIO_DEBUG=y
CONFIG_DM_HIGH_PRECISION_CALC=y
CONFIG_DM_INITIATOR_DELAY_US=2000
CONFIG_DM_RANGING_OFFSET_US=100000
CONFIG_DM_MIN_TIME_BETWEEN_TIMESLOTS_US=100000
CONFIG_DM_TIMESLOT_QUEUE_COUNT_SAME_PEER=3
CONFIG_MPSL=y
CONFIG_MPSL_TIMESLOT_SESSION_COUNT=3
CONFIG_MPSL_WORK_STACK_SIZE=8192

CONFIG_SETTINGS_NONE=y
CONFIG_SETTINGS=y

CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_MIN_REQUIRED_HEAP_SIZE=1024

# Use internal clock source
CONFIG_CLOCK_CONTROL_NRF=y
CONFIG_CLOCK_CONTROL=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y

# Enable PWM buzzer module
CONFIG_PWM=y
CONFIG_NRFX_PWM1=y
CONFIG_NRFX_PWM2=y

# Enable ADC
CONFIG_ADC=y

# Enable NVS
CONFIG_NVS=y

CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_MPU_ALLOW_FLASH_WRITE=y

CONFIG_REBOOT=y

# Below configurations to enable DFU
# Enable mcumgr.
CONFIG_NCS_SAMPLES_DEFAULTS=y
CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y
CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU_SPEEDUP=y
CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_SIGN_IMAGES=y
CONFIG_SECURE_BOOT=y
CONFIG_SB_SIGNING_KEY_FILE="priv_key.pem"

# Some command handlers require a large stack.
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096

# power management
CONFIG_PM_DEVICE=y