First thing that comes to mind when the sd card cannot be found (from experience) is that I thought it was fat32, but it wasn’t.
Are you sure it’s fat32?
I had a 128 GB SD card, which is not able to format properly (higher than 4 Gigs) with Windows alone and (for me) the sd card association formatter did not work as it made exFat without the ability to change the type.
So I had a workaround with Rufus: Clarification on SD Card size limit (32Gb?)
Also, if you have another board laying around, you can try to check if that board can mount?