Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wb/STM32WB10_CM4/IPCC/C1CR#0x0
Control register CPU1
processor 1 Receive channel occupied interrupt enable
processor 1 Transmit channel free interrupt enable
https://github.com/modm-io/cmsis-svd-stm32