Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wl3/STM32WL33/AES/AES_KEYR2#0x0
AES_KEYRx register
KEY [((32x)+31):((32x)+0)]: Cryptographic key, bits [((32x)+31):((32x)+0)]
https://github.com/modm-io/cmsis-svd-stm32