SK-TDA4VM: Accessing MCSPI from MCU R5F

Part Number: SK-TDA4VM

I am trying to route the MCSPI5 interrupt (intr_spi 0) to MCU1_0 on a J721E system running PSDK RTOS 09.02.00.05 (It's a custom board)

According to the TISCI interrupt configuration tables here:
https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j721e/interrupt_cfg.html

I found:
MAIN2MCU_LVL_INTRTR0 input index 53  ←  MCSPI5 intr_spi 0
MAIN2MCU_LVL_INTRTR0 output index 53 →  MCU_R5FSS0_CORE0 interrupt 213

My code:

static int32_t intern_CfgIrqRouter(uint32_t src_dev, 
                                   uint32_t offset,
                                   uint32_t dest_dev,
                                   uint32_t intNum)
{
    struct tisci_msg_rm_irq_set_req     rmIrqReq = {0};
    struct tisci_msg_rm_irq_set_resp    rmIrqResp = {0};

    rmIrqReq.valid_params           = TISCI_MSG_VALUE_RM_DST_ID_VALID |
                                      TISCI_MSG_VALUE_RM_DST_HOST_IRQ_VALID;

    rmIrqReq.src_id                 = src_dev;   /* TISCI_DEV_MCSPI5 */
    rmIrqReq.src_index              = offset;    /* 0 = intr_spi 0   */
    rmIrqReq.dst_id                 = dest_dev;  /* TISCI_DEV_MCU_R5FSS0_CORE0 */
    rmIrqReq.dst_host_irq           = intNum;    /* 213 = OUTL_53 mapped IRQ */

    rmIrqReq.global_event           = 0;
    rmIrqReq.ia_id                  = 0;
    rmIrqReq.vint                   = 0;
    rmIrqReq.vint_status_bit_index  = 0;

    return Sciclient_rmIrqSet(&rmIrqReq, &rmIrqResp, SCICLIENT_SERVICE_WAIT_FOREVER);
}

/* Call: */
intern_CfgIrqRouter(TISCI_DEV_MCSPI5, 0, TISCI_DEV_MCU_R5FSS0_CORE0,
                    CSLR_MCU_R5FSS0_CORE0_INTR_MAIN2MCU_LVL_INTRTR0_OUTL_53);

Sciclient_rmIrqSet() returns an error code: -1

My question:
1. Does dst_host_irq = 213 fall within the interrupt allocations for MCU1_0 in the default boardcfg_rm?
2. Is MCSPI5 officially supported as an interrupt source for MCU1_0 in the J721E architecture?