Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7/STM32H723/RAMECC2/M1FDRH#0x0
RAMECC monitor x failing data high register
Failing data high (64-bit memory)
https://github.com/modm-io/cmsis-svd-stm32