Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32H7x5_CM7/TIM17/TIM17_TISEL#0x0
TIM17 input selection register
selects TI1[0] to TI1[15] input
https://github.com/cmsis-svd/cmsis-svd-data