Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wba5/STM32WBA52/FLASH/FLASH_OEM2KEYR2#0x0
FLASH OEM2 key register 2
OEM2 key most significant bytes
https://github.com/modm-io/cmsis-svd-stm32