This is a rare issue when an NFC session remains open in the background, that can be fixed with a hard reboot. On most modern iPhones (8, X, 11, 12, 13, 14, 15, etc.), you force‑restart like this:
- Quickly press and release the Volume Up button.
- Quickly press and release the Volume Down button.
- Press and hold the Side (power) button.
- Keep holding until you see the Apple logo, then release.
After the reset, your NFC scanner should work again.
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