Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32GG12B/EFM32GG12B810F1024GQ100/CAN1/MESSAGESTATE#0x0
Message Valid Register
Message Valid Bits (of All Message Objects)
https://github.com/cmsis-svd/cmsis-svd-data