Update: Greenlots quietly resolved this.
I called Greenlots about a month ago (after 3 emails went nowhere), spoke to a representative, and calmly told her how disappointed I was that I PAID $5 for this rfid card that doesn't even work, how ChargePoint and EVGo sent me theirs for free and they have been flawless, but that I still love Greenlots, and yada yada yada, if you can have someone who specializes in this area give me a call back so that this can be resolved, I'd appreciate it. Well, I never did get that call, but I was cruising around today, and did 3 dcfc sessions, on the second of which, I had the genius idea to retry the card. Success, it said, whereas before it was "invalid". The first one was a free station, but the next one was a paid station, and worked great too.
This was obviously an error on their end, but I'm just glad they got things ironed out. Maybe I should call them up and see if they want the other 2 rfid cards they sent me back :lol: If you're reading, thanks Greenlots!