PM_Static with MCU_Boot and external Flash

Question

Hello and thanks for reading. I am working with the NRF5340DK and Zephyr (SDK 2.5.0). 
 As our project has grown, we can no longer fit all our code and MCU boot in the internal flash. Seeing as the DK has an external flash chip on QSPI, we figured we would use that to store our code. 
 We started out with the example provided in the developer academy, and that worked well. 
 It seemed wasteful, however, to have 8K of flash and to only use ~1K, keeping the second MCUBOOT image on the NRF5340's internal flash. 
 Also, our code has kept growing, so we decided to try and put both the primary and secondary slots for MCUBOOT on the external flash, with two images of 4K each. 
 This is leading to problems with setting up our PM_Static.yml, and I was hopeful you could take a look and help us figure out what we are doing wrong. 
 Here is my PM_Static.yml right now: 
 # Custom NVS storage partition (flash_primary)
custom_nvs_storage:
 address: 0x00000
 size: 0x2000 # 8 KB
 region: flash_primary

# Settings storage partition (flash_primary)
settings_storage:
 address: 0x2000
 size: 0x2000 # 8 KB
 region: flash_primary

# External QSPI Flash (8 MB)
qspi_flash:
 address: 0x0
 region: external_flash
 size: 0x800000 # 8 MB

# mcuboot partitions in QSPI flash (external flash)
mcuboot_primary:
 address: 0x0
 size: 0x400000 # 4 MB
 region: qspi_flash

mcuboot_secondary:
 address: 0x400000
 size: 0x400000 # 4 MB
 region: qspi_flash
 
 And here are the relevant error messages: 
 -- Found partition manager static configuration: C:/Users/foo/Documents/GitHub/foo/pm_static.yml
Partition 'settings_storage' is not included in the dynamic resolving since it is statically defined.
Partition 'mcuboot_primary' is not included in the dynamic resolving since it is statically defined.
Partition 'mcuboot_secondary' is not included in the dynamic resolving since it is statically defined.
Partition manager failed: End of last partition is after last valid address
Failed to partition region flash_primary, size of region: 1048576
Partition Configuration:
custom_nvs_storage:
 size: 8192
mcuboot:
 placement: {}
 size: 49152
mcuboot_pad:
 placement:
 before:
 - mcuboot_primary_app
 size: 512
settings_storage:
 size: 8192 
 And here are the project configs in case that helps you: 
 MCUBoot project config: 
 CONFIG_FLASH=y

CONFIG_BOOT_SIGNATURE_TYPE_ECDSA_P256=y
# CONFIG_BOOT_SIGNATURE_KEY_FILE="dev_ec256_priv.pem"
CONFIG_MAIN_STACK_SIZE=10240
CONFIG_MULTITHREADING=y

CONFIG_LOG=y
CONFIG_LOG_MODE_MINIMAL=y

CONFIG_BOOT_ENCRYPT_IMAGE=y
# CONFIG_BOOT_ENCRYPTION_KEY_FILE="dev_ec256_priv.pem"

#clock config
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y

CONFIG_SOC_HFXO_CAP_EXTERNAL=n
CONFIG_SOC_HFXO_CAP_INTERNAL=y
CONFIG_SOC_HFXO_CAP_INT_VALUE_X2=16

#Code protection
CONFIG_NRF_APPROTECT_LOCK=y

CONFIG_NORDIC_QSPI_NOR=y
CONFIG_BOOT_MAX_IMG_SECTORS=512 
 mcuboot overlay: 
 / {
	chosen {
 nordic,pm-ext-flash = &mx25r64;
	};
}; 
 prj.conf 
 #GPIO
CONFIG_GPIO=y
CONFIG_PINCTRL=y

#UART & SERIAL & system
CONFIG_SERIAL=y
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y

CONFIG_MAIN_STACK_SIZE=8192
CONFIG_LOG=y
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=8192

CONFIG_TIMESLICING=y

#CPP
CONFIG_CPP=y
CONFIG_REQUIRES_FULL_LIBCPP=y
CONFIG_STD_CPP20=y

#i2C
CONFIG_I2C=y

#spi
CONFIG_SPI=y

#usb
CONFIG_USB_DEVICE_VID=0xC0FF
CONFIG_USB_DEVICE_PID=0xA55A

#flash
CONFIG_SETTINGS=y
CONFIG_BT_SETTINGS_CCC_STORE_ON_WRITE=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_NVS=y
CONFIG_FLASH_MAP=y
CONFIG_MPU_ALLOW_FLASH_WRITE=y
CONFIG_FILE_SYSTEM=y
CONFIG_SOC_FLASH_NRF=y
CONFIG_NORDIC_QSPI_NOR=y

#PM
CONFIG_PARTITION_MANAGER_ENABLED=y

#math
CONFIG_CMSIS_DSP=y
CONFIG_CMSIS_DSP_SVM=y
CONFIG_NEWLIB_LIBC=y
CONFIG_FPU=y
# CONFIG_CMSIS_DSP_TRANSFORM=y
# CONFIG_TFM_ENABLE_CP10CP11=y
CONFIG_CMSIS_DSP_FILTERING=y

#BLE
CONFIG_BT=y
CONFIG_BT_BONDABLE=n #dont need bonding for HID, get rid of it.
CONFIG_BT_SETTINGS=y
CONFIG_BT_GATT_CLIENT=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DEBUG_LOG=y
CONFIG_BT_CENTRAL=y
CONFIG_BT_BROADCASTER=y
CONFIG_BT_OBSERVER=y

CONFIG_BT_DEVICE_NAME_DYNAMIC=y
CONFIG_BT_DEVICE_NAME_MAX=30

#NUS
CONFIG_BT_NUS=y
CONFIG_BT_NUS_AUTHEN=n

#BT BATTERY SERVICE (BAS)
CONFIG_BT_BAS=y

#DIS
CONFIG_BT_DIS=y #all non-pnp DIS settings are done dynamically
CONFIG_BT_DIS_PNP=n
CONFIG_SETTINGS_RUNTIME=y
CONFIG_BT_DIS_SETTINGS=y

CONFIG_BT_DIS_MODEL="foo"
CONFIG_BT_DIS_MANUF="foo"
CONFIG_BT_DIS_SERIAL_NUMBER=y
CONFIG_BT_DIS_FW_REV=y
CONFIG_BT_DIS_HW_REV=y
CONFIG_BT_DIS_SW_REV=y
CONFIG_BT_DIS_SERIAL_NUMBER_STR="xxxxxxxx"
CONFIG_BT_DIS_FW_REV_STR="0"
CONFIG_BT_DIS_HW_REV_STR="0"
CONFIG_BT_DIS_SW_REV_STR="0"

#BT HID
CONFIG_NCS_SAMPLES_DEFAULTS=y

CONFIG_BT_MAX_CONN=6
CONFIG_BT_SMP=y
CONFIG_BT_L2CAP_TX_BUF_COUNT=5
CONFIG_BT_DEVICE_APPEARANCE=962

CONFIG_BT_HIDS=y
CONFIG_BT_HIDS_MAX_CLIENT_COUNT=2
CONFIG_BT_HIDS_DEFAULT_PERM_RW_ENCRYPT=y
CONFIG_BT_GATT_UUID16_POOL_SIZE=40
CONFIG_BT_GATT_CHRC_POOL_SIZE=20

CONFIG_BT_CONN_CTX=y

#2MEG PHY & MTU
CONFIG_BT_AUTO_PHY_UPDATE=n
# CONFIG_BT_CTLR_PHY_2M=y
# CONFIG_BT_AUTO_PHY_UPDATE=y
# CONFIG_BT_USER_PHY_UPDATE=y

CONFIG_BT_USER_DATA_LEN_UPDATE=y
CONFIG_BT_BUF_ACL_RX_SIZE=251
CONFIG_BT_BUF_ACL_TX_SIZE=251
CONFIG_BT_CTLR_DATA_LENGTH_MAX=251
CONFIG_BT_L2CAP_TX_MTU=247

CONFIG_BT_ATT_PREPARE_COUNT=4
CONFIG_BT_CONN_TX_MAX=10
CONFIG_BT_L2CAP_DYNAMIC_CHANNEL=y

CONFIG_BT_PERIPHERAL_PREF_MIN_INT=6
CONFIG_BT_PERIPHERAL_PREF_MAX_INT=24
CONFIG_BT_PERIPHERAL_PREF_LATENCY=0
CONFIG_BT_PERIPHERAL_PREF_TIMEOUT=400

#ADC
CONFIG_ADC=y
CONFIG_ADC_ASYNC=y

#timer
CONFIG_COUNTER=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y 
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y 
CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM=y 
CONFIG_SOC_HFXO_CAP_EXTERNAL=n 
CONFIG_SOC_HFXO_CAP_INTERNAL=y 
CONFIG_SOC_HFXO_CAP_INT_VALUE_X2=16 
CONFIG_BOOTLOADER_MCUBOOT=y 
CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y 
CONFIG_BT_MAX_PAIRED=1 
CONFIG_BT_KEYS_OVERWRITE_OLDEST=y