I had a simple project working previously using the RFID reader where I could scan the included RFID card, as well as a set of cards I purchased from amazon, and see the IDs in the console as expected. It's been several months, and I'm trying to do the same thing again on a different tessel2 with the same cards, but a newer firmware. The strange thing is that the card that was included with the module itself scans fine, but the cards purchased from amazon no longer trigger.
Is this a known issue? The amazon cards were definitely working before.