Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wb/STM32WB10_CM4/PKA/SR#0x0
PKA status register
PKA Operation in progress
PKA End of Operation flag
RAM error flag
Address error flag
https://github.com/modm-io/cmsis-svd-stm32