Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Renesas Electronics/R7FA4M1AB/CAN0/MKR[0]#0x0
Mask Register
Extended ID
Standard ID
These bits are read as 000. The write value should be 000.
https://github.com/cmsis-svd/cmsis-svd-data