Ok, sound good.
I do not have this board so I can not test it, but I provide some tips what you can check.
- Terminators - 2x 120ohm on both ends of CAN-BUS
- Common GND
- Just for test, try send normal ID format (not extended).
- Try another transceiver - Some time ago we had here similar issue, it was solved by replacing transceiver (was faulty) CAN BUS STM32 Nucleo F429ZI CAN Write Fail - Mbed OS - Arm Mbed OS support forum
BR, Jan