Hi,
I’m trying to enable access to a STM32 as a I2C slave, I have this working in a isolated project but when I try a pulling it into our main project and enable CONFIG_I2C=y in the prj.conf I am getting the error

gen_isr_tables.py: error: multiple registrations at table_index 9 for irq 9 (0x9)
Existing handler 0x2c837, new handler 0x2c837
Has IRQ_CONNECT or IRQ_DIRECT_CONNECT accidentally been invoked on the same irq multiple times?

I can get the two projects working in isolation getting GNSS fix and data + LTE comms and posting data to API in one project and reading writing data to I2C slave in the other

When pulling in the slave project all I did was add

&i2c1 {
  stm32slave: stm32@2A {
        compatible = "st,stm32-slave";
        reg = <0x2A>; // I2C address of the STM32 device
        label = "STM32_AUDIO_WING";
    };
};

to the circuitdojo_feather_nrf9160_ns.overlay and CONFIG_I2C=y to the prj.conf plus the code for reading and writing to the slave

I see zephyr.dts has

...
                        uart1: uart@9000 {
				compatible = "nordic,nrf-uarte";
				reg = < 0x9000 0x1000 >;
				interrupts = < 0x9 0x1 >;
				status = "disabled";
				current-speed = < 0x1c200 >;
				pinctrl-0 = < &uart1_default >;
				pinctrl-1 = < &uart1_sleep >;
				pinctrl-names = "default", "sleep";
			};
...
			i2c1: i2c@9000 {
				compatible = "nordic,nrf-twim";
				#address-cells = < 0x1 >;
				#size-cells = < 0x0 >;
				reg = < 0x9000 0x1000 >;
				clock-frequency = < 0x186a0 >;
				interrupts = < 0x9 0x1 >;
				status = "okay";
				pinctrl-0 = < &i2c1_default >;
				pinctrl-1 = < &i2c1_sleep >;
				pinctrl-names = "default", "sleep";
				pcf85063a@51 {
					compatible = "nxp,pcf85063a";
					reg = < 0x51 >;
				};
				lis2dh: lis2dh@18 {
					compatible = "st,lis2dh";
					reg = < 0x18 >;
					irq-gpios = < &gpio0 0x1d 0x0 >;
					disconnect-sdo-sa0-pull-up;
				};
				stm32slave: stm32@2A {
					compatible = "st,stm32-slave";
					reg = < 0x2a >;
					label = "STM32_AUDIO_WING";
				};
			};
...
                       spi1: spi@9000 {
				compatible = "nordic,nrf-spim";
				#address-cells = < 0x1 >;
				#size-cells = < 0x0 >;
				reg = < 0x9000 0x1000 >;
				interrupts = < 0x9 0x1 >;
				max-frequency = < 0x7a1200 >;
				easydma-maxcnt-bits = < 0xd >;
				status = "disabled";
			};
...

but spi1 and uart1 are disabled so that shouldn’t be it

here is the prj.conf for reference just in case there is a conflict I don’t know about.

# General
CONFIG_FPU=y
# CONFIG_UART=n
CONFIG_NRF_MODEM_LIB=y
CONFIG_STDOUT_CONSOLE=y
# CONFIG_UART_INTERRUPT_DRIVEN=n
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y

# Networking
CONFIG_NETWORKING=y
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_POSIX_NAMES=y
CONFIG_NET_NATIVE=n

# Enable I2C
CONFIG_I2C=y

# Memory and stack configuration
CONFIG_HEAP_MEM_POOL_SIZE=2048
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=1536

# GPS Antenna configuration
CONFIG_MODEM_ANTENNA=y
CONFIG_MODEM_ANTENNA_AT_COEX0="AT%XCOEX0=1,1,1565,1586"

# PDN library
CONFIG_PDN=y
CONFIG_PDN_ESM_STRERROR=y

# LTE Link Control
CONFIG_MODEM_KEY_MGMT=y
CONFIG_LTE_LINK_CONTROL=y
CONFIG_LTE_NETWORK_MODE_LTE_M_GPS=y
# Request eDRX from the network
CONFIG_LTE_EDRX_REQ=y
CONFIG_LTE_PSM_REQ=y
# PSM requested periodic TAU 6 hours and 40 minutes (400 minutes)
CONFIG_LTE_PSM_REQ_RPTAU="00101000"
# PSM requested active time 6 seconds
CONFIG_LTE_PSM_REQ_RAT="00000011"

# IPV4 only thanks Telstra
CONFIG_PDN_DEFAULTS_OVERRIDE=y
CONFIG_PDN_DEFAULT_FAM_IPV4=y

CONFIG_TFM_KEY_FILE_S="C:/ncs/v2.4.1/modules/tee/tf-m/trusted-firmware-m/bl2/ext/mcuboot/root-RSA-3072.pem"
CONFIG_TFM_KEY_FILE_NS="C:/ncs/v2.4.1/modules/tee/tf-m/trusted-firmware-m/bl2/ext/mcuboot/root-RSA-3072_1.pem"
CONFIG_USE_SEGGER_RTT=y
CONFIG_RTT_CONSOLE=y
CONFIG_NEWLIB_LIBC_MIN_REQUIRED_HEAP_SIZE=2048
CONFIG_DEBUG_THREAD_INFO=y
CONFIG_DEBUG_OPTIMIZATIONS=y

CONFIG_MODEM=y
CONFIG_MODEM_INFO=y
CONFIG_HTTP_PARSER_URL=y
CONFIG_HTTP_CLIENT=y

# Logging
CONFIG_LOG=y
CONFIG_LOG_MODE_IMMEDIATE=y
CONFIG_LOG_BACKEND_UART=n
CONFIG_LOG_BACKEND_RTT=y
CONFIG_LTE_LINK_CONTROL_LOG_LEVEL_DBG=n
CONFIG_NET_LOG=y
CONFIG_NET_PKT_LOG_LEVEL_DBG=n
CONFIG_NET_HTTP_LOG_LEVEL_DBG=y
CONFIG_NRF_MODEM_LIB_LOG_LEVEL_DBG=y

# Date Time library
CONFIG_DATE_TIME=y

# Power management
CONFIG_PM_DEVICE=y

# Settings
CONFIG_SETTINGS=y
CONFIG_SETTINGS_RUNTIME=y

# Nordic trace
CONFIG_NRF_MODEM_LIB_TRACE=y
CONFIG_AT_HOST_LIBRARY=y #(note this is optional)
``` 

Has anyone encountered a similar issue before or can provide some guidance on how to resolve this? I appreciate any help!

Thanks in advance.