Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h5/STM32H523/TAMP/TAMP_BKP23R#0x0
TAMP backup 23 register
The application can write or read data to and from these registers.
https://github.com/modm-io/cmsis-svd-stm32