Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wl3/STM32WL33/LPAWUR/PAYLOAD_1#0x0
PAYLOAD_1 register
Second part of the payload (Least significant Byte First)
https://github.com/modm-io/cmsis-svd-stm32