^ Hi Ed. From what I've read, any US-market '22 Tucson that has the "Hyundai Digital Key" feature will allow an NFC Card Key to be registered and utilized.
If you're having issues getting the Hyundai Digital Key to work consistently using your Android smartphone, the problem may be with the smartphone itself or the vehicle's NFC electronics. Is the Hyundai Digital Key issue you're experiencing intermittently related also to the unlocking (and locking) of your driver door or is it just starting the vehicle an issue at times? If you're able to always unlock (and lock) the driver door with your smartphone, but you're not always able to start the vehicle with your smartphone placed on the wireless charging pad/digital key authentication pad, then a problem may exist with the digital key authentication pad. I would think the dealer should be able to sort this out in short order.
- Richard