Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7/STM32H723/DFSDM/DFSDM_FLT1CHGR#0x0
injected channel group selection register
Injected channel group selection
https://github.com/modm-io/cmsis-svd-stm32