Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32l5/STM32L552/FLASH/SECWM1R2#0x0
Flash secure watermak1 register 2
PCROP1_PSTRT
PCROP1EN
HDP1_PEND
HDP1EN
https://github.com/modm-io/cmsis-svd-stm32