I have a M5Stack with RC522, and if I run the example at https://github.com/m5stack/M5-ProductExampleCodes/tree/master/Unit/RFID/Arduino/RFID I get zero response.
I've tried swiping bank cards, library books with RFID, access cards, but nothing happens. What kind of RFID token should it react on, so assure it's working and not broken?