FileX exfat format parameters for 64gb card, correct parameters

[OHaza.1]

I'm trying to use fileX for format a card with filex with exfat but having some issues,

after the format when I create a file the file says it is already created, presumably from a previous format, possibly with regular FAT.

Currently calling as

status = fx_media_exFAT_format(&sdio_disk, fx_stm32_sd_driver,

(VOID *)FX_NULL,

(UCHAR *)media_memory,

                sizeof(media_memory),

                "EX_DISK" /* Volume Name */,

                1 /* Number of FATs */,

32768 /* Hidden sectors */,

hsd1.SdCard.LogBlockNbr /* Total sectors */,

                512 /* Sector size */,

                256 /* Sectors per cluster */,

                12345 /* Volume ID */,

                8192 /* Boundary unit */);

these are the values suggested by the Microsoft guide, although their total sectors is slightly different so I use what's read from the card.

Wondering if the values are wrong or if there is some other issue