Did you self-implant or did you get it done? Have you, or whoever did it for you, checked that the chip didn’t come back out?
It’s happened to me once at the piercer’s. She punched the needle through, depressed the plunger fully, removed the needle and threw the syringe in the trash. Then we tried for a good 10 minutes to feel the chip inside my hand - nothing. No reading off the cellphone either. Eventually, we looked carefully in the trashcan and there it was, in some gauze. We were both careful, but it was almost impossible to spot.
I don’t mean to scare you, but unless you’re 100% sure you watched the needle come out empty, and you double-checked that the dark rod that was poking out of the bevel was the plunger and not the chip, this might have happened.