Hi,
SDK software call below function to set RX Masking mechanism:
/* Set Rx Masking mechanism. */
FLEXCAN_SetRxMbGlobalMask(EXAMPLE_CAN, FLEXCAN_RX_MB_STD_MASK(rxIdentifier, 0, 0));
I checked FLEXCAN_SetRxMbGlobalMask() function with below definition:

Please set second param mask to 0 to allow receive all ID CAN frame.
Wish it helps.
Have a great day,
Mike
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