Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wb/STM32WB15_CM4/AES2/IVR0#0x0
initialization vector register 0
initialization vector register (LSB IVR [31:0])
https://github.com/modm-io/cmsis-svd-stm32