Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFM32TG11B/EFM32TG11B540F64GQ64/CAN0/IF0IFS#0x0
Message Object Interrupt Flag Set Register
Set MESSAGE Interrupt Flag
https://github.com/cmsis-svd/cmsis-svd-data