Ha! Assuming your clones are successful, it might be a readability issue from the readers you’re trying to use. The NExT should have come with two field detector keychains. There should be an LF version, and you should use this to test the best location and orientation to present your implant to the reader with. This is why they are included in the kit.
Take some photos of the readers and post videos of you trying to use the keychain to find the best spot on the reader to get the LED inside the keychain to light up. We can advise from there.