Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32l4/STM32L412/RTC/WUTR#0x0
wakeup timer register
Wakeup auto-reload value bits
Wakeup auto-reload output clear value
https://github.com/modm-io/cmsis-svd-stm32