There are many reasons leading to this situation, I will give the most basic and common reason that is: QR code is blurred
And to fix it it's important to use a color that creates enough contrast between the background and foreground color of your QR code for the scanner to interpret the code quickly.
Avoid mixing or blending similar light or dark colors; Otherwise, it will take forever to scan it or never!
For example, light colors, such as yellow and pastel colors are not good for scanning, so it is best to use darker colors and white backgrounds.
You can add creativity with your QR code color and experiment with it as long as you don't compromise its quick readability by not creating enough contrast.
An advanced QR code generator that allows you to customize your QR code more than just producing it in a solid color.
and even if you can't scan the QR code, it won't affect the user's data
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Respected Sir/Madam, I am Hardworking and persistent. I will complete this job as soon as possible and I will deliver each and every claim I make. Hopefully you consider my proposal.