Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wl/STM32WL5x_CM0P/RTC/WUTR#0x0
WUTR
Wakeup auto-reload value bits
Wakeup auto-reload output clear value
https://github.com/modm-io/cmsis-svd-stm32