Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32u5/STM32U535/ADC1/ADC_OFR3#0x0
ADC offset register
OFFSET
POSOFF
USAT
SSAT
OFFSET_CH
https://github.com/modm-io/cmsis-svd-stm32