Why is QR unsuccessful?

QR codes can fail due to design and printing issues such as blurry images, low resolution, insufficient color contrast (e.g., light colors on a dark background), or being too small to scan. Other reasons include broken or expired links, having too much embedded data, or poor physical placement where glare or lighting interferes with scanning. For payment-related QR code issues, insufficient bank balance or network connectivity problems may also cause failure.