This thread (here: Library PN532 for nano 33 ble) looks like it has a solution, but I cannot understand the reason for the change in numbers under Adafruit_SPIDevice fixing the issue.
I did a little prying and found that the "1000000" under the Adafruit_SPIDevice library is BusIOBitOrder; the amount of bits per second (can be considered as 1000 khz or 1 Mhz).
The library doesn't work on the nRF processor without changing this to '100000', possibly since it was originally written for ATmega microcontrollers and not nRF, which uses 100 khz rather than 1 Mhz.
I tried looking through the datasheets for the processor and found no reason for why this change is necessary. Any ideas?
I assumed it was clock speed, but the processor is 64 Mhz, not 1 Mhz? Is SPI speed a thing? I feel like I'm not understanding this on a fundamental level.