Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32u5/STM32U535/ADC4/ADC_CHSELRMOD1#0x0
ADC channel selection register [alternate]
SQ1
SQ2
SQ3
SQ4
SQ5
SQ6
SQ7
SQ8
https://github.com/modm-io/cmsis-svd-stm32