Pioneer CDJ2000nx2 not loading music from my USB - drive is formatted in FAT-32 and working fine in Rekordbox

I'm trying to load my USB drive into my Pioneer CDJ2000nx2 and it keeps telling me to format the drive and not recognising it. The drive is formatted in FAT-32 as it should be and when uploading my music from Rekordbox to the drive it is doing so with no issues. When I look at the drive on my laptop all the music files are there and playable.

I have the latest version of software on the CDJ and also Rekordbox, and the USB is brand new and recommended to use with the CDJ - SanDisk Extreme Portable SSD.

I used SanDisk Ultra Luxe prior to these USBs and they were writing fine but then crashing when plugged in (going on emergency loop) and then all the content data was wiped (artist, playlist, album etc) and I was just left with a single contents folder with all my music in there.

I'm not sure if the issue is with Rekordbox or the CDJs, but it would be strange for both decks to have the same issue which makes me think its Rekordbox or how my Mac is writing to the drives.