Silly question, but did you try to take a reading before implanting it? And immediately after?
Me, I never implant anything that doesn’t read out of my body unless I absolutely have to. And then as soon as it’s in, i read it again. If it won’t reply at all, I have the piercer check if the chip is still in the needle. If it’s not, I have em remove it immediately.
All that double and triple checking spared me a few failed implant jobs.