Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h5/STM32H533/SAES/SAES_KEYR7#0x0
SAES key register 7
Cryptographic key, bits [255:224]
https://github.com/modm-io/cmsis-svd-stm32