- Your Apple device isn’t running iOS 11 or later. If your device is unable to run iOS 11 or later, you can download a third-party app to scan QR codes. You can also update your iOS version. - Your screen’s brightness is too low. It needs to be bright enough for the camera to see the QR code or the QR code won’t scan. - Your camera lens has a smudge on it that’s obscuring the camera’s recognition of the QR code. If you don’t, the QR code doesn’t work. - Your phone is tilted or in any other position than upright. To scan a QR code with an iPhone, your phone must be held vertically. - Your iPhone may be too close to or too far from the QR code. There’s a sweet spot for the camera to be able to recognize and scan QR codes. It’s when the 10:1 ratio is hit exactly. A good method to find it is to hold your device about a foot from the QR code. Then slowly move in closer to it until it scans.